The Atlantic Slave Trade
Four centuries in which European traders forced an estimated 12.5 million Africans onto ships bound for the Americas, and the enslaved people, revolts, and abolitionists who fought it from the first crossing to the last
Beginning with a Portuguese raiding party in 1441 and ending with Brazil's abolition in 1888, the Atlantic slave trade forced an estimated 12.5 million Africans across the ocean, according to the Trans-Atlantic Slave Trade Database, and killed roughly 1.8 million of them before they ever reached land. It built the sugar, tobacco, and cotton economies of the Americas and the ports of Liverpool, Bristol, and Nantes on that labor. It was met from the start by resistance aboard ship and on plantations, by the only successful large-scale slave revolt in Haiti, and by an abolition movement built as much by the enslaved and formerly enslaved as by Wilberforce or the Quakers.
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Events
- 1441Well documented
Reputable source · 2 sourceswhy?
Best source: Launching the Portuguese Slave Trade in Africa
The domain "ldhi.library.cofc.edu" is on our Reputable source registry.A Portuguese Raiding Party Sells the First Captive Africans in Lisbon
In 1441, the Portuguese captain Antao Goncalves, sailing under Prince Henry the Navigator's program of exploration down the West African coast, kidnapped a man and a woman from the Rio de Oro region of what is now Western Sahara. When he offered to trade them back, their community gave him ten enslaved sub-Saharan Africans in exchange, whom Goncalves carried to Portugal for resale. It was a small, almost improvised transaction, a handful of people traded on the spot rather than a planned commercial voyage. But it established the pattern the Portuguese crown would formalize within a few years: African captives, purchased or seized along the coast, shipped back to Iberia and sold. Three years later a much larger expedition under Lancarote de Freitas would turn that pattern into an organized market at Lagos.
Why it matters: This single trade is the first documented instance of Europeans transporting enslaved sub-Saharan Africans across open water for commercial resale, the seed of a traffic that would eventually move an estimated 12.5 million people. It also set the template of ransom-turned-commerce that recurs throughout the trade's early decades: raiding gave way to purchasing once Portuguese traders realized African merchants and rulers would sell captives directly.
How we know: The Lowcountry Digital History Initiative's exhibit on Iberia and the Atlantic world, hosted by the College of Charleston, traces the documented sequence of Portuguese voyages down the African coast in the 1430s and 1440s using period Portuguese chronicles and subsequent scholarship on the earliest slaving voyages.
Year: 1441 · Captain: Antao Goncalves · Region: Rio de Oro, present-day Western Sahara · Sponsor: Prince Henry the Navigator
SourcesRelated timelines- The Age of Exploration → · Henry the Navigator's voyages down the African coast were framed as exploration and reconnaissance. They were also, from the very first years, a slaving enterprise.
- August 8, 1444Well documented
Primary source · 2 sourceswhy?
Best source: The Chronicle of the Discovery and Conquest of Guinea
Cited as a "primary" source (no stronger domain match).Zurara Chronicles the First Slave Auction at Lagos
On August 8, 1444, six caravels commanded by the merchant Lancarote de Freitas returned to the Portuguese port of Lagos carrying 235 captive Africans seized in raids along the Mauritanian coast. The royal chronicler Gomes Eanes de Zurara, writing within a decade of the event, described what followed on the beach: officials arrived to divide the captives into shares for the crown, the backers of the voyage, and Prince Henry, tearing apart families in the process. Zurara wrote that the officials had to "part fathers from sons, husbands from wives, brothers from brothers," and that mothers threw themselves over their children rather than be separated from them. Zurara, who supported the trade and framed it as bringing captives to Christian salvation, still could not write the scene without recording the grief of the people being divided.
Why it matters: This is the first slave auction in Europe for which a detailed eyewitness account survives, and it set a pattern of family separation at the point of sale that would recur at every slave market on both sides of the Atlantic for the next four centuries. Zurara's chronicle, written to celebrate Portuguese expansion, became instead one of the earliest primary documents historians use to study how the trade actually operated on the ground.
How we know: Zurara's Chronicle of the Discovery and Conquest of Guinea, written around 1453 and preserved in Portuguese archives, is the primary source for this event; a translated excerpt is hosted by Miami University's Empire studies program. Zurara was present in Lagos and states in the text that he personally saw the descendants of the captives living as Christians in the town years later.
Date: August 8, 1444 · Location: Lagos, Portugal · Number sold: 235 captives, per Zurara · Chronicler: Gomes Eanes de Zurara
- January 8, 1455Well documented
Primary source · 2 sourceswhy?
Best source: Pope Nicolas V and the Portuguese Slave Trade
Cited as a "primary" source (no stronger domain match).Pope Nicholas V Grants Portugal Religious Cover to Enslave Africans
On January 8, 1455, Pope Nicholas V issued the papal bull Romanus Pontifex, following an earlier bull, Dum Diversas, in 1452. Together the two documents granted King Afonso V of Portugal the right to invade, conquer, and enslave non-Christian peoples encountered south of Cape Bojador on the West African coast, and gave Portugal an exclusive claim over trade there against other Christian powers. The bull framed enslavement as a vehicle for converting Africans to Catholicism, language church leaders used to argue slavery served as what one Lowcountry Digital History Initiative essay calls a natural deterrent and Christianizing influence on people they described as barbarous. No European army ever occupied the territory the bull described. Portugal instead pursued the trade it authorized through commerce, buying captives from African merchants and rulers along existing trade networks rather than by conquest.
Why it matters: Romanus Pontifex gave the Portuguese crown, and by extension the merchants it licensed, a religious and legal justification that outlasted the pope who wrote it. Later slaving nations, including Spain, cited this framework of Christian dominion over non-Christian peoples to defend their own participation in the trade for the next three centuries, long after the theological argument had been challenged by other churchmen.
How we know: The text of Romanus Pontifex survives in the Arquivo Nacional da Torre do Tombo in Lisbon; the Lowcountry Digital History Initiative's exhibit on Iberian slavery quotes and analyzes the bull directly, tracing how it was invoked in later Portuguese and Spanish slaving law.
Date: January 8, 1455 · Issued by: Pope Nicholas V · Beneficiary: King Afonso V of Portugal · Preceded by: Dum Diversas, 1452
- c. 1500sWell documented
Reputable source · 2 sourceswhy?
Best source: Life on a Colonial Sugar Plantation
The domain "worldhistory.org" is on our Reputable source registry.Sao Tome Becomes the First Tropical Sugar-and-Slavery Colony
Following earlier sugar experiments on Madeira, Portuguese settlers established sugar plantations on the island of Sao Tome in the Gulf of Guinea using enslaved labor imported mainly from the Kingdom of Kongo and Ndongo, in present-day Angola. By the 1530s Sao Tome had become the largest sugar producer supplying European markets, run entirely on a workforce of enslaved Africans rather than the mixed free and enslaved labor used on Madeira. It was the first place where Europeans combined large-scale monocrop plantation agriculture with a labor force composed exclusively of enslaved Africans, a combination that had not existed at this scale before.
Why it matters: Sao Tome's plantation system, sugar grown for export on land worked entirely by enslaved Africans under European ownership, became the template that Portuguese colonists carried to Brazil in the 1530s and that other European powers later copied across the Caribbean. The economic logic that would eventually consume millions of lives was tested and proven on this one small island first.
How we know: Colonial Williamsburg's Slavery and Remembrance project and World History Encyclopedia both trace the sugar plantation model's transfer from Madeira to Sao Tome to Brazil, drawing on Portuguese colonial records and the scholarship of historians including A. R. Disney and Malyn Newitt.
Location: Sao Tome, Gulf of Guinea · Crop: Sugar · Labor source: Kongo and Ndongo (Angola) · Peak: 1530s, largest sugar supplier to Europe
SourcesRelated timelines- Medieval Africa → · The Kingdom of Kongo, which had converted to Catholicism and traded with Portugal as a diplomatic partner, became one of the trade's earliest sources of enslaved captives.
- August 18, 1518Well documented
Primary source · 2 sourceswhy?
Best source: Charter of 1518
Cited as a "primary" source (no stronger domain match).Charles V Opens the Direct Trade From Africa With the First Asiento
Before 1518, Spain's American colonies received enslaved Africans only indirectly, after they had first been brought to Spain or Portugal and baptized as Christians. On August 18, 1518, Holy Roman Emperor Charles V issued a charter, an asiento, to his courtier Lorenzo de Gorrevod granting him permission to ship 4,000 enslaved Africans directly from West Africa to Spain's American colonies, ending the requirement that captives first touch Iberian soil. Gorrevod, who had no shipping operation of his own, immediately sold the license to Genoese merchant financiers for a substantial profit. The asiento system this charter created, in which the Spanish crown sold monopoly licenses to supply enslaved Africans to its colonies rather than trading directly, would structure Spanish colonial slaving for the next two centuries.
Why it matters: This charter opened the first large-scale direct sea route between West Africa and the Americas, the route that would carry the overwhelming majority of the roughly 12.5 million people forced across the Atlantic over the following three and a half centuries. The asiento license also became a valuable diplomatic prize; European wars would later be fought partly over which nation held the right to supply Spanish America with enslaved labor.
How we know: The original charter is held in the Archivo General de Indias in Seville and is reproduced and translated by the University of Miami's Slavery, Law and Power digital archive, alongside analysis by the Lowcountry Digital History Initiative.
Date: August 18, 1518 · Issued by: Emperor Charles V · Recipient: Lorenzo de Gorrevod · License size: 4,000 enslaved Africans
SourcesRelated timelines- The Spanish Empire → · The asiento system Charles V created to supply Spain's American colonies with enslaved labor became one of the most fought-over commercial privileges in the Spanish empire.
- 17th centuryWell documented
Reputable source · 2 sourceswhy?
Best source: Regional Labor Experiences: Sugar and Tobacco
The domain "ldhi.library.cofc.edu" is on our Reputable source registry.Sugar and Tobacco Fix the Plantation System in Place
By the mid-seventeenth century, European colonists in the Caribbean, Brazil, and mainland North America had built distinct plantation economies around enslaved African labor, tied to the particular crop each region grew. Sugar, the most capital-intensive crop, required large enslaved workforces and produced Black population majorities across Brazil and the Caribbean islands. Tobacco in the Chesapeake could turn a profit with smaller numbers of enslaved workers, since planters there could rely on fresh land cleared by enslaved labor rather than the sustained investment sugar demanded. Cotton did not become a dominant crop in the American South until the invention of the cotton gin in the 1790s, after which it would eclipse tobacco and drive the internal expansion of slavery into the Deep South. Each crop, the Lowcountry Digital History Initiative notes, shaped the size and structure of the enslaved labor force differently, but all three depended on it entirely.
Why it matters: The crop-specific plantation economies built in this period are what generated the demand that kept the transatlantic trade running for two more centuries. Sugar alone consumed enslaved lives at a rate that required constant replacement through new shipments from Africa, since planters found it cheaper to work people to death and import more than to sustain a population through births.
How we know: The Lowcountry Digital History Initiative's African Passages exhibit and Thomas Jefferson's Monticello Foundation both document the crop-by-crop structure of colonial plantation slavery using plantation records, colonial correspondence, and probate inventories from Virginia, the Caribbean, and Brazil.
Major crops: Sugar, tobacco, later cotton · Sugar regions: Brazil, the Caribbean · Tobacco region: the Chesapeake · Cotton's rise: after the 1790s cotton gin
- 1672Well documented
General source · 2 sourceswhy?
Best source: Transatlantic Slave Trade
Cited as a "reference" source (no stronger domain match).The Royal African Company Wins a Crown Monopoly on English Slaving
England's first chartered slaving company, the Company of Royal Adventurers, received a royal monopoly in 1660 and an expanded charter explicit about the slave trade in 1663 before collapsing under debt in 1667. It reorganized in 1672 under a new royal charter as the Royal African Company, with a monopoly on English trade along the West African coast, including the exclusive right, in the company's own charter language, to the buying and selling of enslaved people. The company branded captives with the initials RAC or the Duke of York's initials as a mark of ownership before shipment, a practice documented in company records and later court testimony. Between 1672 and the loss of its monopoly in 1698, the Royal African Company transported an estimated 100,000 to 150,000 enslaved Africans to England's American colonies.
Why it matters: The Royal African Company was the mechanism through which the English crown itself, rather than private individual traders, became a direct commercial party to the slave trade, with King Charles II and his brother the Duke of York as its largest shareholders. Its loss of monopoly status in 1698 opened the trade to independent merchants across England, which is what allowed Bristol and then Liverpool to grow into the trade's dominant English ports.
How we know: The company's original charters and stock records are held in British archives; historical summaries of its structure and branding practices are documented across multiple institutional histories, including PBS's Africans in America project and Encyclopedia Virginia's holdings of the original 1660s charter text.
Chartered: 1672 (reorganized from 1660/1663 predecessor) · Major shareholders: Charles II and the Duke of York · Estimated captives shipped: 100,000-150,000, 1672-1698 · Monopoly ended: 1698
SourcesRelated timelines- The British Empire → · The Royal African Company made the English crown a direct commercial party to the slave trade before Parliament opened it to independent merchants in 1698.
- February 18, 1688Well documented
Primary source · 2 sourceswhy?
Best source: The Journey to Emancipation: the Germantown Protest, 1688
Cited as a "primary" source (no stronger domain match).Germantown Quakers Write the First Formal Antislavery Protest in the Colonies
In 1688, Francis Daniel Pastorius, a German-born attorney who had founded Germantown, Pennsylvania five years earlier, drafted a formal antislavery resolution together with three fellow Quakers living in the settlement. The petition argued from the Bible's golden rule, that people should treat others as they would wish to be treated, and asserted that every human being, regardless of belief, color, or ethnicity, held rights that slavery violated. The Germantown Meeting passed the petition up through the Quaker organizational hierarchy, to the Monthly Meeting at Dublin, the Quarterly Meeting in Philadelphia, and finally the Yearly Meeting in Burlington, New Jersey, which declined to take a position for or against slavery and set the petition aside. The document was effectively forgotten until it was rediscovered in 1844 and embraced by the American abolitionist movement then gathering strength, only to be misplaced again and rediscovered a second time in 2005 in a Philadelphia meetinghouse vault.
Why it matters: The Germantown petition is the earliest known formal, written objection to African slavery by an organized religious body in the English colonies, predating the British Society for Effecting the Abolition of the Slave Trade by nearly a century. Its rediscovery in 1844 gave nineteenth-century American abolitionists a homegrown religious precedent to cite, even though the original Quaker meeting had shelved it without action.
How we know: The original 1688 petition document survives and is held at the Arch Street Meetinghouse in Philadelphia; both the National Park Service and the Smithsonian's National Museum of African American History and Culture have published transcriptions and historical analysis of the document and its two rediscoveries.
Date: 1688 (dated February 18 by some sources) · Location: Germantown, Pennsylvania · Author: Francis Daniel Pastorius, with three fellow Quakers · Rediscovered: 1844, then again in 2005
- 18th centuryWell documented
General source · 2 sourceswhy?
Best source: Transatlantic Slave Trade
Cited as a "reference" source (no stronger domain match).Liverpool, Bristol, and Nantes Grow Rich on the Triangular Trade
By the early eighteenth century the transatlantic slave trade operated on a three-legged route that historians call the triangular trade. Ships left European ports, chiefly Liverpool, Bristol, and Nantes, loaded with manufactured goods: iron bars, textiles, firearms, and liquor. On the West African coast, traders exchanged these goods for captive Africans purchased from African merchants and rulers. The ships then crossed the Atlantic on the Middle Passage and sold survivors in the Americas, before loading sugar, tobacco, cotton, and other colonial products for the return voyage to Europe, completing the cycle. Liverpool overtook Bristol as Britain's leading slaving port by 1750 and by the period 1793 to 1807 accounted for roughly 85 percent of all British slaving voyages. The profits reshaped these cities: warehouses, docks, insurance markets, and elegant townhouses in Liverpool, Bristol, Nantes, and Bordeaux were built substantially on capital earned from the trade.
Why it matters: The triangular trade made slaving profitable at every stage of the voyage rather than only on the sale of captives, which is what allowed it to scale into an industrial-sized traffic rather than remaining a series of isolated raids. The wealth it generated financed banks, insurance markets, and industries in Liverpool, Bristol, and Nantes that outlasted the trade itself by generations.
How we know: Colonial Williamsburg's Slavery and Remembrance project documents the triangular route and the rise of these specific ports using shipping records and port customs data; the Trans-Atlantic Slave Trade Database's own voyage records independently confirm Liverpool's dominance in the trade's final decades.
Major European ports: Liverpool, Bristol, Nantes, Bordeaux · Liverpool's share, 1793-1807: about 85% of British voyages · Route: Europe to West Africa to the Americas to Europe · Return cargo: sugar, tobacco, cotton, rum
SourcesRelated timelines- The Age of Exploration → · The triangular trade route grew directly out of the Atlantic shipping lanes European navigators had charted since the fifteenth century.
- 17th-18th centuriesWell documented
Primary source · 2 sourceswhy?
Best source: The Maroons
Cited as a "primary" source (no stronger domain match).Maroon Communities Carve Out Freedom in the Mountains and Forests
Across the Americas, enslaved Africans who escaped plantations formed maroon communities in terrain too remote or difficult for colonial militias to easily reach, mountainous interiors in Jamaica, forested river borders in Suriname, and similar refuges elsewhere. In Jamaica, Maroon communities in the eastern mountains fought British colonial forces to a standstill for decades; unable to defeat them, the British colonial government signed treaties with the Leeward Maroons in 1738 and the Windward Maroons in 1739, granting them recognized autonomy. In Suriname, which passed from English to Dutch control under the 1667 Treaty of Breda, enslaved people who escaped plantations along the Commewijne and Marowijne Rivers built their own villages from the late seventeenth century onward; the Ndyuka Maroons there signed a peace treaty with Dutch authorities in 1760, drafted in part by a formerly enslaved man from Boston named Adyako Benti Basiton, that granted them territorial autonomy. Maroon communities descended from these settlements, including Jamaica's Charles Town, Moore Town, Accompong Town, and Scott's Hall, survive today.
Why it matters: Maroon communities are direct, sustained evidence that enslaved Africans resisted the plantation system by building alternative societies, not only through individual escape or occasional revolt, and that colonial powers were sometimes forced to recognize that resistance through negotiated treaties rather than military victory. Their persistence into the present, as legally distinct communities in Jamaica and Suriname today, is a direct continuity from the resistance built during the height of the slave trade.
How we know: Colonial Williamsburg's Slavery and Remembrance project documents the Jamaican and Surinamese maroon treaties and their negotiated terms, drawing on colonial treaty records and subsequent historical scholarship on both communities.
Jamaica treaties: 1738 (Leeward Maroons), 1739 (Windward Maroons) · Suriname treaty: 1760 (Ndyuka) · Surviving Jamaican Maroon towns: Charles Town, Moore Town, Accompong Town, Scott's Hall
- September 9, 1739Well documented
Primary source · 2 sourceswhy?
Best source: Two Views of the Stono Slave Rebellion, South Carolina, 1739
Cited as a "primary" source (no stronger domain match).Twenty Enslaved Men Rise Up at the Stono River
Early on Sunday, September 9, 1739, a group the colonial record calls Angola Negroes, numbering about twenty and led by a man named Jemmy, gathered near the Stono River roughly twenty miles from Charleston, South Carolina. They broke into a store belonging to a Mr. Hutchenson, killed the two storekeepers they found there, and armed themselves with the guns and powder inside. Beating drums and calling out for liberty, the group marched south toward Spanish Florida, where a Spanish proclamation had promised freedom to enslaved people escaping British colonies, recruiting more enslaved people and burning houses as they went, sparing at least one enslaver known to treat enslaved people kindly. Colonial militia caught up with them that afternoon; more than twenty white colonists and roughly forty Black South Carolinians were killed before the uprising was suppressed, with surviving participants later tried and executed.
Why it matters: South Carolina's colonial assembly responded with the Negro Act of 1740, which barred enslaved people from growing their own food, assembling in groups, earning and keeping their own money, and learning to read, and imposed a temporary moratorium on new slave imports out of fear of further revolt. The rebellion is documented evidence that enslaved people organized armed resistance from the earliest years of American plantation slavery, not only after abolitionist movements emerged decades later.
How we know: Two contemporary 1739 accounts survive, one from an unnamed white colonial official and one oral history passed down through descendants of a rebellion leader named Cato, both preserved and published by the National Humanities Center; BlackPast.org's summary draws on the same colonial record and subsequent historical scholarship.
Date: September 9, 1739 · Location: Stono River, South Carolina · Leader: Jemmy, described as Angolan · Colonial response: South Carolina Negro Act of 1740
- 18th century (typical of the crossing, 1501-1866)Well documented
Primary source · 3 sourceswhy?
Best source: Estimates
Cited as a "primary" source (no stronger domain match).The Middle Passage Kills Roughly One in Seven Who Board
Enslaved Africans forced aboard slave ships were packed into spaces built to maximize the number carried rather than to keep people alive, chained below decks with barely room to turn over, for a crossing that typically took six to ten weeks. According to the Trans-Atlantic Slave Trade Database, of an estimated 12.5 million people embarked on slave ships across the trade's entire span, roughly 10.7 million disembarked alive in the Americas, meaning nearly 1.8 million died during the crossing itself. Mortality rates were highest in the sixteenth century, close to 30 percent of those embarked, and fell to below 15 percent by the trade's final decades as ship design and provisioning improved, though improvement here meant preserving profit rather than reducing suffering. Voyages to the Spanish Americas had the highest death rates of any route; voyages to Brazil had the lowest, though still close to one in eight. Disease, dehydration, suffocation, violence by crew, and suicide by captives who threw themselves overboard all contributed to the toll, and historians note that the true death toll of the trade, counting deaths during capture, the march to the coast, and the first year after arrival, was substantially higher than the deaths recorded at sea alone.
Why it matters: The Middle Passage's mortality is the single clearest measure of the trade's violence: it means the estimated 12.5 million people who were embarked understates by millions the number of Africans actually killed by the trade once capture, the coastal march, and post-arrival deaths are included. The Trans-Atlantic Slave Trade Database's voyage-by-voyage mortality figures, drawn from ship logs and insurance and customs records, are what allow historians to state this scale with precision rather than estimate.
How we know: The Trans-Atlantic Slave Trade Database compiles records from more than 36,000 individual slaving voyages, drawing on ship manifests, customs house records, and insurance documents; its published estimates of 12.5 million embarked and 10.7 million disembarked are the figures historians cite as the current scholarly consensus, understood as an estimate built from documented and inferred voyages rather than an exact count.
Estimated embarked: 12,521,337 (Trans-Atlantic Slave Trade Database) · Estimated disembarked: 10.7 million · Estimated deaths at sea: roughly 1.8 million · Typical crossing time: 6-10 weeks
- February-March 1766Well documented
Reputable source · 2 sourceswhy?
Best source: No. 1038: Slave Mutiny in South Africa, 1766
The domain "laits.utexas.edu" is on our Reputable source registry.Malagasy Captives Seize the Meermin off the Cape
The Dutch East India Company slave ship Meermin left Madagascar in January 1766 bound for the Cape Colony in southern Africa, carrying roughly 140 Malagasy captives. The ship's chief merchant, hoping to reduce deaths from disease among people held shackled in overcrowded conditions, had the captives unshackled and, in mid-February, ordered them to clean a stock of Madagascan weapons being carried in the hold. The Malagasy used the weapons to seize the ship instead, killing roughly half the Dutch crew during the uprising while losing close to 30 of their own. The two sides reached a truce in which the crew agreed to sail back to Madagascar, but the remaining Dutch sailors deceived the Malagasy, who lacked navigational knowledge, and steered instead toward the South African coast, telling the captives the land they saw was still part of Madagascar. The ship ran aground near the mouth of the Heuningnes River, and the Malagasy were recaptured and enslaved at the Cape after all. A Dutch East India Company court later found the ship's captain guilty of negligence and banned him from the company and the colony for life, while the mutiny's leader, a man named Massavana, was spared execution but imprisoned for life on Robben Island.
Why it matters: The Meermin mutiny shows enslaved captives organizing and briefly succeeding at armed resistance at sea, only to be undone by their captors' knowledge of navigation and geography rather than by force. It is documented through Dutch East India Company court records, giving historians an unusually detailed institutional account of a shipboard revolt from the trade's own bureaucracy.
How we know: Dutch East India Company court proceedings and correspondence in the Cape Town archives document the mutiny and its aftermath in detail; a University of Cape Town honors thesis and contemporaneous reporting on efforts to locate the wreck both draw directly on these records.
Date: February-March 1766 · Ship: Meermin (Dutch East India Company) · Captives: approximately 140 Malagasy · Mutiny leader: Massavana
- June 22, 1772Well documented
Primary source · 2 sourceswhy?
Best source: Somerset v. Steuart (1772)
Cited as a "primary" source (no stronger domain match).Lord Mansfield Rules Slavery Has No Basis in English Law
James Somerset, an enslaved man purchased in Virginia by the merchant Charles Steuart, was brought by Steuart to England in 1769. In 1771 Somerset left Steuart's service; when he was recaptured and held aboard a ship bound for sale in Jamaica, the abolitionist Granville Sharp, who had spent years searching for a case to challenge slavery's legal standing in England, took up Somerset's cause and secured a writ of habeas corpus. Lord Chief Justice Mansfield of the Court of King's Bench heard arguments over several months before ruling, on June 22, 1772, that Charles Steuart had no lawful right to seize Somerset and forcibly remove him from England to be sold abroad. Mansfield deliberately kept his ruling narrow, resting it on the specific act of forcible removal rather than declaring slavery itself illegal in England, but his opinion held that slavery could only exist by positive law, not by custom, and no English statute had ever established it.
Why it matters: Although Mansfield avoided ruling on slavery's legal status outright, the decision was widely understood by the public, including London's Black community, as effectively ending chattel slavery on English soil, and it became a foundational precedent cited by British and American abolitionists for the following century. Contemporary estimates suggested the ruling could affect as many as 14,000 to 15,000 enslaved people then living in England.
How we know: The case record and Mansfield's ruling are preserved in English court reports of the period; the University of Miami's Slavery, Law and Power project and English Heritage, which maintains Mansfield's former home at Kenwood House, both document the case using the original legal proceedings.
Date decided: June 22, 1772 · Judge: Lord Mansfield, Court of King's Bench · Enslaved man: James Somerset · Backer: Granville Sharp
- November 29, 1781Well documented
General source · 2 sourceswhy?
Best source: The Zong Massacre (1781)
Cited as a "reference" source (no stronger domain match).The Zong's Crew Throws 132 Enslaved People Overboard for an Insurance Claim
The British slave ship Zong, owned by a Liverpool trading syndicate led by William Gregson, left West Africa overloaded with roughly 470 captive Africans and a crew of only seventeen. Navigational errors extended the voyage far beyond its expected length, and by late November 1781 disease had already killed several crew members and more than 50 captives as food and drinking water ran low. Starting November 29, 1781, the ship's captain, Luke Collingwood, ordered the crew to begin throwing captives overboard, reasoning that if they died of thirst or illness aboard ship the loss would not be covered by insurance, but if they were thrown into the sea while still alive, their deaths could be claimed as a jettisoned cargo loss. Over the following days the crew threw 132 sick and dying captives into the ocean; roughly ten more jumped overboard rather than submit. When the ship reached Jamaica, Gregson's syndicate filed an insurance claim for the captives as lost cargo. The insurers refused to pay, and the resulting court case, Gregson v Gilbert, centered entirely on whether the deliberate killing of enslaved people constituted a legitimate insurance loss. No crew member was ever criminally prosecuted for the deaths.
Why it matters: The Zong case exposed to the British public, in stark and undeniable terms, that enslaved people were legally treated as insurable cargo whose deliberate killing could be litigated as a commercial dispute rather than prosecuted as murder. Formerly enslaved abolitionist Olaudah Equiano and campaigner Granville Sharp both worked to publicize the case, and historians credit the outrage it generated with meaningfully strengthening the British abolition movement in the following decade, even though the men responsible faced no criminal consequence.
How we know: The Gregson v Gilbert court proceedings, recorded in British legal reports of the period, document the case in detail; BlackPast.org and the London Museum both summarize the case using these court records and contemporaneous abolitionist correspondence from Sharp and Equiano.
Date: November 29, 1781 onward · Ship: Zong · Owners: William Gregson syndicate, Liverpool · Killed: 132 thrown overboard; about 10 more jumped · +1 more
Sources- BlackPast.org. The Zong Massacre (1781) · reference
- London Museum. The Zong Massacre Trial · reference
Related timelines- The British Empire → · The Zong's owners were a Liverpool syndicate operating within the same imperial slaving economy that made the city Britain's leading slave port.
- May 22, 1787Well documented
Primary source · 2 sourceswhy?
Best source: The abolitionists
Cited as a "primary" source (no stronger domain match).Twelve Men in a Quaker Print Shop Found the British Abolition Committee
On May 22, 1787, twelve men met in a Quaker print shop on George Yard, off Lombard Street in London, and formed the Society for Effecting the Abolition of the Slave Trade. Nine of the twelve were Quakers, who had been building antislavery sentiment within their own religious community for decades; the remaining three, including the group's most tireless researcher, Thomas Clarkson, were Anglican. Clarkson had won a Cambridge University essay prize in 1785 for an essay asking whether it was lawful to enslave people without their consent, and his research into the subject had left him, in his own account, horrified enough to abandon his plan to enter the clergy and devote himself to the cause instead. As the only committee member without other business commitments, Clarkson traveled to every major British slaving port, gathering evidence, ship diagrams, and testimony from sailors and surgeons that he then supplied to William Wilberforce for use in Parliament.
Why it matters: This committee, run by Quakers and a handful of allies rather than by Parliament or the church hierarchy, built the organizational and evidentiary machine, petitions, pamphlets, ship diagrams, sailor testimony, that Wilberforce needed to eventually pass the Slave Trade Act twenty years later. It set a template for single-issue reform campaigns built on documented evidence rather than moral appeal alone.
How we know: The UK Parliament's own historical archive documents the committee's founding, membership, and Clarkson's fieldwork using surviving committee minutes and Clarkson's own later published account of his research.
Date founded: May 22, 1787 · Location: George Yard, Lombard Street, London · Composition: 9 Quakers, 3 Anglicans, including Clarkson and Sharp · Key researcher: Thomas Clarkson
- 1789 (narrative published; crossing occurred c. 1756)Well documented
Primary source · 3 sourceswhy?
Best source: Olaudah Equiano, 1789
Cited as a "primary" source (no stronger domain match).Olaudah Equiano Describes His Own Crossing
Olaudah Equiano, kidnapped from what he identified as the Igbo region of West Africa as a child and eventually enslaved in the British Caribbean and North America, published The Interesting Narrative of the Life of Olaudah Equiano in 1789 after buying his own freedom. In it he described being loaded onto a slave ship and packed below deck among people so crowded each had scarcely room to turn himself. He wrote that the closeness of the space and the heat produced constant sweating, that the air became unbreathable from the resulting stench, and that sickness spread and killed many of the people chained around him, whom he called victims of what he termed the improvident avarice of the men who had purchased them. Equiano survived the crossing and went on to become a leading voice in the British abolition movement, testifying before Parliament and touring the country to sell his narrative and speak against the trade.
Why it matters: Equiano's narrative is one of the only widely read accounts of the Middle Passage written by someone who survived it, and it circulated in Britain at exactly the moment Clarkson and Wilberforce were building parliamentary support for abolition. Historians credit its firsthand detail, impossible for slave-trade defenders to dismiss as secondhand exaggeration, with meaningfully shaping British public opinion ahead of the 1807 Slave Trade Act.
How we know: Equiano's own published narrative is the primary source; the Gilder Lehrman Institute of American History holds and has digitized period editions and excerpts of the text alongside contextual materials on its composition and reception.
Author: Olaudah Equiano · Published: 1789 · Region of origin claimed: Igbo region, West Africa · Later role: British abolitionist campaigner
- 1776-1800Well documented
Primary source · 2 sourceswhy?
Best source: Estimates
Cited as a "primary" source (no stronger domain match).The Trade Reaches Its Highest Volume in the Late Eighteenth Century
According to the Trans-Atlantic Slave Trade Database's decade-by-decade tally of documented and estimated voyages, the quarter-century from 1776 to 1800 saw more Africans embarked on slave ships, over two million people, than any other twenty-five-year span in the trade's roughly 400-year history. The preceding twenty-five years, 1751 to 1775, had already carried close to 1.93 million, meaning the trade's final major decades before serious abolition efforts began were also its largest by volume. British, French, and Portuguese traders all expanded shipments through this period to meet the labor demands of an expanding plantation system across the Caribbean, Brazil, and the American South.
Why it matters: The trade reached its greatest scale at precisely the moment Clarkson, Wilberforce, and Equiano were beginning to build the British abolition campaign, meaning abolitionists were fighting the trade at its historical peak rather than a trade already in decline. The scale of these final decades is also why the domestic and internal slave systems the trade fed, particularly in the American South and Brazil, remained large enough to persist for decades after the transatlantic trade itself was outlawed.
How we know: The Trans-Atlantic Slave Trade Database's published estimates table breaks the trade's volume into 25-year intervals based on more than 36,000 documented voyages and statistical estimation for undocumented ones, allowing historians to identify precisely which decades carried the largest number of captives.
Peak period: 1776-1800 · Estimated embarked, 1776-1800: 2,008,670 · Estimated embarked, 1751-1775: 1,925,315 · Source: Trans-Atlantic Slave Trade Database
- August 21, 1791 (revolution to January 1, 1804)Well documented
Reputable source · 2 sourceswhy?
Best source: The Haitian Revolution (1791-1804): A Different Route to Emancipation
The domain "history.as.uky.edu" is on our Reputable source registry.The Only Successful National Slave Revolt Creates Haiti
On August 21, 1791, enslaved people in the French colony of Saint-Domingue, the wealthiest slave colony in the Americas and the world's leading producer of sugar and coffee, rose in a coordinated rebellion against the colony's planters, inspired in part by news of the French Revolution's declarations of universal rights. By 1792 the rebels controlled roughly a third of the colony, and the fighting continued to escalate despite reinforcements France sent to suppress it. Toussaint Louverture, a formerly enslaved man, emerged as the revolution's most significant military and political leader, transforming what began as a fragmented uprising into an organized army and government, though he died in French custody in 1802 before the war's end. Fighting continued after his death, and on January 1, 1804, the colony's forces declared independence as Haiti, the first nation in the Americas to abolish slavery through its own revolution and the first republic in the world founded and led by formerly enslaved people of African descent.
Why it matters: Haiti's revolution is the only slave uprising in history to succeed in creating an independent nation, and its example terrified slaveholding governments across the hemisphere for decades, shaping decisions from the Louisiana Purchase to the caution of later American and British abolitionists about openly endorsing armed revolt. It stands as proof that the enslaved could not only resist the system but overthrow it entirely, at a scale no other rebellion in the Americas achieved.
How we know: The revolution is documented through French colonial and military records, the University of Kentucky's academic history of the period, and BlackPast.org's summary of the conflict's major phases, all drawing on the same underlying record of French and Haitian government and military documents.
Revolt began: August 21, 1791 · Independence declared: January 1, 1804 · Key leader: Toussaint Louverture (d. 1802) · Result: First Black republic in the Americas
SourcesRelated timelines- The French Revolution → · The Haitian Revolution drew directly on the French Revolution's declarations of universal rights, then went further than France itself was willing to go in applying them to enslaved people.
- March 25, 1807Well documented
Primary source · 3 sourceswhy?
Best source: Parliament abolishes the slave trade
Cited as a "primary" source (no stronger domain match).Britain Outlaws the Slave Trade, Though Not Slavery Itself
After two decades of campaigning by the Society for Effecting the Abolition of the Slave Trade, Prime Minister Lord Grenville introduced the Slave Trade Abolition Bill in the House of Lords on January 2, 1807. Its introduction by the head of government marked abolition as official policy for the first time, and the bill passed its second reading in the Lords 100 votes to 34 despite opposition from peers with financial interests in West Indian plantations. William Wilberforce, who had led the parliamentary campaign since 1787 after being persuaded by Thomas Clarkson's research, steered the bill through the Commons. The bill received royal assent on March 25, 1807, making it illegal from May 1, 1807 for any British ship or subject to trade in enslaved people, though it did not free a single person already enslaved in Britain's colonies.
Why it matters: The 1807 act removed Britain, then the trade's dominant carrier, from the transatlantic slave trade entirely, forcing other nations to either follow suit or continue the trade under greater international pressure and, eventually, Royal Navy interdiction. It left slavery itself legal throughout the British Empire for another 26 years, meaning abolitionists' fight was only half finished, and the domestic use of enslaved labor in British colonies continued essentially unchanged.
How we know: UK Parliament's own historical archive documents the bill's legislative path, vote counts, and royal assent date using surviving parliamentary records from the period.
Royal assent: March 25, 1807 · Effective date: May 1, 1807 · Key campaigners: William Wilberforce, Thomas Clarkson · Scope: Banned the trade; did not free existing enslaved people
SourcesRelated timelines- The British Empire → · The Slave Trade Act removed Britain from the trade it had dominated for half a century, though slavery itself would remain legal in British colonies for another 26 years.
- January 1, 1808Well documented
Primary source · 2 sourceswhy?
Best source: The Slave Trade
Cited as a "primary" source (no stronger domain match).The United States Bans the Importation of Enslaved People
Article I, Section 9 of the US Constitution barred Congress from prohibiting the importation of enslaved people before 1808, a compromise struck at the Constitutional Convention to secure Southern states' support. An 1800 act of Congress had already made it illegal for Americans to participate in the international slave trade between other countries and authorized US authorities to seize violating ships. Congress then passed the Act Prohibiting the Importation of Slaves, which took effect on January 1, 1808, the earliest date the Constitution permitted, making it illegal to bring enslaved people into any US port from a foreign country. The law imposed real penalties, including fines and imprisonment, on Americans who violated it. It did not, however, end slavery within the United States or prohibit the sale and transport of already-enslaved people between American states, a domestic trade that would grow substantially in the decades that followed.
Why it matters: The 1808 act closed off the legal supply of newly enslaved Africans to the United States, but because it left the domestic trade in already-enslaved people entirely legal, it shifted rather than ended the country's internal slave economy, feeding the massive forced migration historians call the second Middle Passage as cotton cultivation expanded into the Deep South.
How we know: The National Archives holds the original 1808 act and related customs manifests documenting the domestic coastwise trade that continued after the international trade was banned, and its education division has published a detailed lesson using these primary documents.
Effective date: January 1, 1808 · Constitutional basis: Article I, Section 9 · Prior step: 1800 act banning US participation in foreign slave trade · Left intact: domestic slave trade between US states
- 1810s-1860sWell documented
Primary source · 2 sourceswhy?
Best source: The Slave Trade
Cited as a "primary" source (no stronger domain match).The Domestic Trade Forces a Million More South After Importation Ends
After the United States banned the importation of enslaved people from abroad in 1808, the domestic slave trade within the country's borders grew to fill the labor demand the international ban could no longer meet, particularly as the cotton gin made cotton newly profitable across the Deep South. Enslavers in the Upper South, in states like Virginia, Maryland, and North Carolina, where declining soil fertility had made tobacco less profitable, increasingly sold enslaved people to planters establishing new cotton plantations in Mississippi, Alabama, and Louisiana. Historian Walter Johnson's estimate, cited by America's Black Holocaust Museum, puts the number of enslaved people forcibly relocated from the Upper South to the Lower South at approximately one million, roughly two-thirds of them moved through the organized domestic slave trade rather than by enslavers relocating with the people they already held. This forced migration, which historians call the Second Middle Passage, was more than twice the scale of the transatlantic Middle Passage in terms of people directly affected.
Why it matters: The domestic trade demonstrates that banning the international slave trade did not shrink American slavery, it relocated its human cost internally, breaking apart families across enormous distances within the country's own borders on a scale larger than the transatlantic crossing itself. It is the direct mechanism by which slavery expanded into the Deep South's cotton economy even after the legal door to Africa had closed.
How we know: America's Black Holocaust Museum's summary draws on historian Walter Johnson's Soul by Soul: Life Inside the Antebellum Slave Market, and the National Archives holds customs manifests documenting individual coastwise shipments of enslaved people between US ports after 1808, used to verify compliance with the international ban.
Period: 1810s-1860s · Estimated relocated: approximately 1 million (Walter Johnson estimate) · Share via organized trade: about two-thirds · Destination region: Deep South cotton states
Sources - 1830s-1860sWell documented
Primary source · 2 sourceswhy?
Best source: Broadside for an auction of enslaved persons at the Charleston courthouse
Cited as a "primary" source (no stronger domain match).Auction Blocks in Charleston and New Orleans Turn People Into Listed Merchandise
By the early nineteenth century, cities across the American South, most prominently Charleston and New Orleans, hosted regular public slave auctions in hotels, courthouses, and dedicated auction houses. A surviving broadside advertised a court-ordered sale at the Charleston courthouse on January 10, 1859, listing 99 enslaved men, women, and children by first name and age, grouped in numbered lots, with handwritten annotations from prospective buyers or auctioneers reading healthy, very fine, sold privately, dead, shot in leg, breeding, leg broke, and lost a toe. In New Orleans, auctions regularly advertised individuals by name and skill, such as a broadside naming Isam, described as a superior engineer and blacksmith, and Pauline, described as speaking French and English, framing enslaved people's labor and their bodies as the two things being sold. New Orleans became one of the largest slave markets in the country from roughly 1830 until the Civil War, with auctions held in its major hotels and dedicated slave depots and showrooms lining its most frequented streets.
Why it matters: These surviving broadsides are direct documentary evidence of how the domestic slave trade reduced named individuals, people with skills, families, and injuries recorded in the same breath as their price, to line items in a for-profit ledger. The annotations on the Charleston broadside, written by buyers evaluating human beings the way they would livestock, are as close as the archive gets to showing the trade's daily mechanics in a market it had made almost casual.
How we know: The original broadsides are held in the collection of the Smithsonian's National Museum of African American History and Culture, which has digitized and published both the Charleston courthouse broadside and multiple New Orleans auction advertisements with full transcriptions.
Major US markets: Charleston, New Orleans · Charleston broadside: 99 enslaved people listed, January 10, 1859 · New Orleans peak period: c. 1830 to the Civil War
- August 28, 1833Well documented
Reputable source · 2 sourceswhy?
Best source: Slavery
The domain "nationalarchives.gov.uk" is on our Reputable source registry.Britain Abolishes Slavery Itself Across Its Empire
Twenty-six years after Britain outlawed the transatlantic slave trade in 1807, Parliament passed the Slavery Abolition Act on August 28, 1833, ending slavery itself across most of the British Empire, effective the following year. The gap between the two laws reflected the reality that banning the trade had not freed a single enslaved person already living in Britain's colonies; abolitionists including William Wilberforce, who died just days after the act's passage, had spent the intervening decades pressing for full emancipation on top of the earlier trade ban. The law included a period of compulsory unpaid apprenticeship for many of the newly freed and paid twenty million pounds in compensation to former slaveholders for the loss of what the law treated as their property, a sum that took British taxpayers until 2015 to finish paying off, while formerly enslaved people themselves received no compensation.
Why it matters: The 1833 act closed the twenty-six-year gap the 1807 trade ban had left open, but its compensation scheme, paying enslavers rather than the enslaved, set a precedent that shaped how Britain and other nations handled abolition afterward, treating the loss of enslaved people as property to be compensated rather than treating slavery itself as a wrong owed to its victims.
How we know: The History of Parliament project and Wikipedia's summary of surviving Treasury records document the act's provisions, the apprenticeship system, and the scale and duration of the compensation payments to former slaveholders.
Passed: August 28, 1833 · Gap since trade ban: 26 years · Compensation to enslavers: 20 million pounds · Compensation loan repaid by UK taxpayers: 2015
SourcesRelated timelines- The Civil Rights Movement → · Abolishing slavery ended one legal system of racial subjugation. The struggle over what would replace it, and who would be compensated for what, echoes into the civil rights movements that followed emancipation on both sides of the Atlantic.
- July 2, 1839Well documented
Primary source · 2 sourceswhy?
Best source: The Amistad Case
Cited as a "primary" source (no stronger domain match).Enslaved Sailors on the Amistad Seize Their Ship
In February 1839, Portuguese slave traders abducted a group of Africans from Sierra Leone in violation of existing treaties banning the trade and shipped them to Havana, Cuba. Two Spanish planters, Pedro Montes and Jose Ruiz, purchased 53 of the captives and put them aboard the schooner Amistad to be transported to a Cuban plantation. On July 2, 1839, the captives, led by a man named Sengbe Pieh, known in American accounts as Joseph Cinque, seized the ship, killing the captain and the ship's cook. They spared Montes and Ruiz on condition the men sail them back to Africa, but Montes secretly steered the ship north instead, and on August 26, 1839, the US brig Washington intercepted the Amistad off Long Island. The Africans were jailed on murder charges, which were later dismissed, while a separate legal battle over their status as property or as free, illegally kidnapped people proceeded through US courts. On March 9, 1841, the US Supreme Court ruled that the Africans had been illegally enslaved to begin with and had exercised a legitimate right to fight for their freedom, ordering their release.
Why it matters: The Amistad case forced US courts to directly confront the legal difference between people enslaved under a domestic system the country's laws still protected and people who had been kidnapped in defiance of international treaties banning the trade, and the Supreme Court sided with the captives on that distinction. Abolitionists used the case's national publicity, including former president John Quincy Adams' personal argument before the Court, to expand American antislavery sentiment in the North.
How we know: The National Archives holds the original case records, including the warrant for habeas corpus and John Quincy Adams' handwritten requests for trial documents, from the Department of Justice, the Treasury Solicitor's office, and the federal district and Supreme Court records generated by the case.
Seizure date: July 2, 1839 · Ship: Amistad · Leader: Sengbe Pieh (Joseph Cinque) · Supreme Court ruling: March 9, 1841, Africans ordered freed
Sources - January 1, 1863Well documented
Primary source · 2 sourceswhy?
Best source: The Emancipation Proclamation: Striking a Mighty Blow to Slavery
Cited as a "primary" source (no stronger domain match).Lincoln's Emancipation Proclamation Reframes the Union's War Aims
President Abraham Lincoln signed the Emancipation Proclamation on January 1, 1863, declaring free all enslaved people held within the states then in rebellion against the Union. The order did not apply to enslaved people in the border states that had remained loyal to the Union, nor to Confederate areas already under Union military control, meaning it freed no one directly at the moment it was signed and relied on advancing Union armies to make it real. Pastor John C. Gibbs of Philadelphia's First African Presbyterian Church, reacting to the news, told his congregation that the proclamation meant humanity must now be free. The proclamation formally redefined the purpose of the Civil War for the Union side, adding the end of slavery to the preservation of the union as a war aim, and it opened the way for roughly 200,000 Black soldiers and sailors to serve in Union forces before the war's end.
Why it matters: The Emancipation Proclamation transformed a war fought to preserve the union into a war that would also end slavery, but it left the institution's legal survival dependent on a Union military victory rather than settling it directly, which is why Lincoln and Congress moved afterward to pass the Thirteenth Amendment to guarantee abolition beyond the reach of any future court or peace settlement.
How we know: The Smithsonian's National Museum of African American History and Culture holds and interprets the proclamation and contemporary reactions to it, including period sermons and newspaper accounts documenting how Black communities in the North received the news in January 1863.
Date signed: January 1, 1863 · Scope: States in rebellion only · Effect: Reframed Union war aims to include ending slavery
SourcesRelated timelines- The American Civil War → · The Emancipation Proclamation turned the war for the union into a war against slavery, and the Thirteenth Amendment two years later finished what it began.
- December 6, 1865Well documented
Primary source · 2 sourceswhy?
Best source: 13th Amendment to the U.S. Constitution: Abolition of Slavery (1865)
Cited as a "primary" source (no stronger domain match).The Thirteenth Amendment Abolishes Slavery in the United States
Congress passed the Thirteenth Amendment to the US Constitution on January 31, 1865, and the required three-fourths of state legislatures ratified it by December 6, 1865, formally abolishing slavery and involuntary servitude throughout the United States except as punishment for a crime. Lincoln had recognized that the Emancipation Proclamation, an executive war order that applied only to Confederate territory, could not permanently guarantee abolition on its own and pushed for a constitutional amendment that would remove the question from the reach of any future court, president, or peace settlement between North and South. Secretary of State William Seward formally certified the amendment's ratification to the world on December 18, 1865.
Why it matters: The Thirteenth Amendment closed the legal gap the Emancipation Proclamation had left open, since that order applied only to rebel territory and rested on wartime military authority rather than permanent law. It is the constitutional act that actually ended slavery in the United States, and the exception it carved out for criminal punishment would become the legal foundation later exploited by convict leasing and mass incarceration.
How we know: The National Archives holds the original enrolled Thirteenth Amendment and the state ratification documents that certified its adoption, which its Milestone Documents collection reproduces alongside a summary of the ratification timeline.
Passed by Congress: January 31, 1865 · Ratified: December 6, 1865 · Certified: December 18, 1865, by Secretary of State William Seward
SourcesRelated timelines- The American Civil War → · The Thirteenth Amendment is the constitutional endpoint of the war's transformation into a fight over slavery, converting Lincoln's wartime proclamation into permanent law.
- May 13, 1888Well documented
Reputable source · 2 sourceswhy?
Best source: 4.3 Abolition
The domain "library.brown.edu" is on our Reputable source registry.Brazil Signs the Golden Law and Becomes the Last Nation in the Americas to Abolish Slavery
Brazil received more enslaved Africans than any other destination in the Americas, and slavery remained central to its economy long after most other nations had abolished it. Reform came in stages: the 1871 Law of Free Birth freed children born to enslaved mothers going forward, and the 1885 Sexagenarian Law freed enslaved people once they reached age sixty, neither of which freed anyone already enslaved and of working age. On May 13, 1888, Princess Isabel, serving as regent while her father Emperor Pedro II was in Europe, signed the Lei Aurea, the Golden Law, abolishing slavery outright throughout Brazil. She had to appoint an entirely new cabinet to get the law passed, since the ministers in power when her regency began refused to discuss the policy with a woman. Brazil's abolition, coming a full 55 years after Britain's and 23 years after the United States', made it the last country in the Americas to end slavery. The law freed roughly 700,000 people still enslaved at the time, but included no land redistribution, no compensation to the formerly enslaved, and no structured path to education or citizenship.
Why it matters: Brazil's abolition closes the chronological arc of legal slavery in the Americas that had opened with the first Portuguese slaving voyages 447 years earlier, and its total absence of support for the newly freed, no land, no wages owed, no citizenship infrastructure, is why historians describe Brazilian abolition as a legal ending without an economic or social one, a pattern that shaped Brazil's racial inequality for generations afterward.
How we know: Brown University Library's Brazil: Five Centuries of Change project documents the Lei Aurea's passage, Isabel's cabinet reshuffle, and the preceding 1871 and 1885 laws using Brazilian legislative records and period accounts of the 1888 signing and public celebration.
Date signed: May 13, 1888 · Signed by: Princess Isabel, Regent of Brazil · Preceding laws: 1871 Law of Free Birth; 1885 Sexagenarian Law · Status: Last country in the Americas to abolish slavery