The American Civil War
The war that ended slavery and remade the nation — from Fort Sumter to Appomattox, every event sourced.
A timeline of the American Civil War (1861–1865) and its immediate aftermath — the secession crisis that followed Lincoln's election, the war's great battles from Bull Run to Gettysburg to Appomattox, the road to emancipation and the service of Black soldiers, the fall of the Confederacy, Lincoln's assassination, Juneteenth, and the dawn of Reconstruction. Every event is backed by content-verified sources, drawn largely from the National Park Service and the national archives.
Events
- November 6, 1860Reputable sourceWell documented
The Election of Abraham Lincoln
Abraham Lincoln, the candidate of the anti-slavery Republican Party, was elected president without carrying a single Southern state. His platform of halting the spread of slavery into the western territories alarmed the slaveholding South.
Why it matters: Lincoln's victory triggered the secession crisis; within weeks Southern states began leaving the Union rather than accept his presidency.
- December 1860 – February 1861Reputable sourceWell documented
Secession and the Formation of the Confederacy
South Carolina became the first state to secede on December 20, 1860. By February 1, 1861, six more Deep South states had followed, and together they formed the Confederate States of America, choosing Jefferson Davis as president. Four more states seceded after the fighting began.
Why it matters: The secession of eleven states over the future of slavery created a rival government and made a war to preserve the Union all but inevitable.
Sources- National Park Service. South Carolina Secession · reference
- April 12, 1861Reputable sourceWell documented
The Firing on Fort Sumter
Confederate forces under General P.G.T. Beauregard opened fire on the Union garrison at Fort Sumter in Charleston Harbor, South Carolina. After a 34-hour bombardment, the garrison commander, Major Robert Anderson, surrendered the fort.
Why it matters: The attack on Fort Sumter began the American Civil War and prompted Lincoln's call for troops, which drove four more states into the Confederacy.
Sources - July 21, 1861Reputable sourceWell documented
The First Battle of Bull Run
In the first major battle of the war, near Manassas, Virginia, an untried Union army under Irvin McDowell attacked Confederate forces. A defensive stand by Thomas 'Stonewall' Jackson turned the tide, and the Union army retreated in disorder toward Washington.
Why it matters: The Confederate victory shattered Northern hopes for a quick, easy war and signaled that the conflict would be long and bloody.
- March 9, 1862Reputable source · 2 sourcesWell documented
Monitor vs. Virginia: The Ironclads Clash
At Hampton Roads, Virginia, the USS Monitor and the CSS Virginia (built on the hull of the former USS Merrimack) fought the first battle in history between two ironclad warships. The four-hour duel ended in a draw, with cannon shot bouncing off both armored ships.
Why it matters: The clash instantly rendered the world's wooden navies obsolete and revolutionized naval warfare.
- April 6–7, 1862Reputable sourceWell documented
The Battle of Shiloh
In southwestern Tennessee, a surprise Confederate attack on Ulysses S. Grant's army was thrown back over two days of ferocious fighting. Around 23,000 men were killed, wounded, or missing — more than all of America's previous wars combined.
Why it matters: Shiloh's staggering toll shocked the nation into realizing the war's true cost, and the Union victory secured its hold on the Western theater.
Sources - June 25 – July 1, 1862Reputable sourceWell documented
The Seven Days Battles
As Union General George McClellan closed in on Richmond during the Peninsula Campaign, the newly appointed Robert E. Lee launched a series of attacks that drove the larger Union army back to the James River, saving the Confederate capital.
Why it matters: The Seven Days Battles made Lee's reputation and cloaked his Army of Northern Virginia in an aura of invincibility that would last for years.
- September 17, 1862Reputable sourceWell documented
The Battle of Antietam
Near Sharpsburg, Maryland, Lee's first invasion of the North met McClellan's Army of the Potomac. In the single bloodiest day in American history, more than 23,000 men were killed, wounded, or missing. Lee was forced to withdraw to Virginia.
Why it matters: The strategic Union victory halted Lee's invasion and gave Lincoln the moment he needed to issue the preliminary Emancipation Proclamation.
Sources - December 13, 1862Reputable sourceWell documented
The Battle of Fredericksburg
Union General Ambrose Burnside hurled wave after wave of troops against entrenched Confederates behind a stone wall on the heights above Fredericksburg, Virginia. The assaults were slaughtered; none reached the wall.
Why it matters: One of the most one-sided Union defeats of the war, Fredericksburg deepened Northern despair and cost Burnside his command.
- January 1, 1863Primary sourceWell documented
The Emancipation Proclamation
President Lincoln issued the Emancipation Proclamation, declaring that all enslaved people in the rebelling states 'are, and henceforward shall be free.' It applied only to Confederate-held areas, not the loyal border states, and it authorized the enlistment of Black men in the Union army and navy.
Why it matters: The Proclamation transformed the war into a struggle for freedom and opened the way for nearly 200,000 Black soldiers and sailors to fight for the Union.
Sources - May 1–4, 1863Reputable sourceWell documented
The Battle of Chancellorsville
Outnumbered nearly two to one, Lee boldly divided his army and sent Stonewall Jackson on a sweeping flank march that crushed the Union right. Often called Lee's greatest victory, the battle came at a terrible cost: Jackson was mortally wounded by his own men.
Why it matters: The victory emboldened Lee to launch his second invasion of the North — but the loss of Jackson robbed him of his finest lieutenant.
- July 1–3, 1863Reputable sourceWell documented
The Battle of Gettysburg
Over three days in Pennsylvania, Lee's second invasion of the North was defeated in the largest battle ever fought in the Western Hemisphere, culminating in the failed assault known as Pickett's Charge. The battle produced some 51,000 casualties — the most of any Civil War battle.
Why it matters: Gettysburg was the turning point of the war in the East; after it, Lee's army could never again mount a major offensive.
- July 4, 1863Reputable sourceWell documented
The Fall of Vicksburg
After a long siege, the Confederate stronghold of Vicksburg, Mississippi, surrendered to Grant on July 4, 1863 — the day after Gettysburg ended.
Why it matters: The fall of Vicksburg gave the Union unrestricted control of the Mississippi River and split the Confederacy in two.
Sources - July 18, 1863Reputable sourceWell documented
The 54th Massachusetts and Black Soldiers
The 54th Massachusetts Volunteer Infantry, one of the first Black regiments raised in the North, led the assault on Fort Wagner outside Charleston, South Carolina. Though the attack failed and their commander, Colonel Robert Gould Shaw, was killed, the regiment's valor was widely celebrated.
Why it matters: The bravery of the 54th helped shatter doubts about Black soldiers and spurred the enlistment of many thousands more into the Union ranks.
- November 19, 1863Primary sourceWell documented
The Gettysburg Address
At the dedication of the soldiers' cemetery at Gettysburg, Lincoln delivered a brief speech of roughly 270 words. In it he cast the war as a test of whether a nation 'conceived in liberty' and dedicated to human equality could endure, and called for 'a new birth of freedom.'
Why it matters: Little noticed at the time, the Gettysburg Address became one of the most revered statements of American democratic ideals ever spoken.
Sources- Library of Congress. The Gettysburg Address · reference
- November 1863Reputable sourceWell documented
The Battles for Chattanooga
In late November 1863, Union forces under Grant broke the Confederate siege of Chattanooga, Tennessee, storming Lookout Mountain and the seemingly impregnable heights of Missionary Ridge.
Why it matters: The victory routed a Confederate army and opened the gateway to the Deep South — the launching point for Sherman's campaign against Atlanta.
- May–June 1864Reputable sourceWell documented
Grant's Overland Campaign
Now general-in-chief of all Union armies, Grant launched a relentless offensive against Lee in Virginia. Through the bloody battles of the Wilderness, Spotsylvania, and Cold Harbor, Grant absorbed enormous casualties but — unlike his predecessors — kept pushing south, pinning Lee's army near Petersburg.
Why it matters: Grant's willingness to accept heavy losses and never retreat began the slow strangulation of Lee's army that would end the war.
- September 2, 1864Reputable sourceWell documented
The Fall of Atlanta
After a months-long campaign across Georgia, Union General William T. Sherman captured Atlanta, a vital Confederate rail and manufacturing center, on September 2, 1864.
Why it matters: The fall of Atlanta was a decisive blow to the Confederacy and a huge boost to Northern morale that helped ensure Lincoln's re-election.
- November 8, 1864Reputable sourceWell documented
Lincoln's Re-election
Running on the National Union ticket against former Union general George McClellan, who ran on a peace platform, Lincoln won re-election decisively, aided by the recent fall of Atlanta and a strong soldier vote.
Why it matters: Lincoln's re-election guaranteed the war would be fought to unconditional Union victory and to the abolition of slavery through the Thirteenth Amendment.
Sources - November – December 1864Reputable sourceWell documented
Sherman's March to the Sea
Sherman marched some 60,000 men from Atlanta to the coast at Savannah, cutting loose from his supply lines and waging 'total war' — destroying railroads, factories, farms, and infrastructure across a wide swath of Georgia. He presented the captured city of Savannah to Lincoln as a 'Christmas gift.'
Why it matters: The march demonstrated the Confederacy's inability to defend its heartland and broke Southern morale, hastening the end of the war.
Sources - January 31, 1865Primary sourceWell documented
The Thirteenth Amendment
Congress passed the Thirteenth Amendment to the Constitution, which declared that 'neither slavery nor involuntary servitude … shall exist within the United States.' It was ratified by the states in December 1865.
Why it matters: The amendment abolished slavery permanently and nationwide, finishing the work the Emancipation Proclamation had begun.
- April 3, 1865Reputable sourceWell documented
The Fall of Richmond
After Grant broke through the Petersburg lines on April 2, 1865, the Confederate government fled and its army evacuated, setting fire to warehouses as it left. Union troops entered the Confederate capital of Richmond, Virginia, the next day.
Why it matters: The fall of Richmond signaled the collapse of the Confederacy; days later, Lee would surrender.
- April 9, 1865Reputable sourceWell documented
Lee's Surrender at Appomattox
With his army surrounded and starving, Robert E. Lee surrendered the Army of Northern Virginia to Ulysses S. Grant at the McLean House in the village of Appomattox Court House, Virginia. Grant offered generous terms, paroling the Confederate soldiers to return home.
Why it matters: Lee's surrender effectively ended the Civil War and set a tone of reconciliation for the peace.
- April 14, 1865Reputable sourceWell documented
The Assassination of Abraham Lincoln
Just five days after Appomattox, actor and Confederate sympathizer John Wilkes Booth shot President Lincoln during a performance of 'Our American Cousin' at Ford's Theatre in Washington. Lincoln died the next morning, April 15, 1865.
Why it matters: Lincoln's assassination robbed the nation of its wartime leader at the dawn of Reconstruction, with lasting consequences for the peace.
- June 19, 1865Reputable sourceWell documented
Juneteenth
Union General Gordon Granger arrived in Galveston, Texas, and issued General Order No. 3, announcing that all enslaved people were free — more than two years after the Emancipation Proclamation and two months after the war's end. The news finally reached the roughly 250,000 people still enslaved in Texas.
Why it matters: Juneteenth, marking the day freedom reached the last enslaved Americans, became the oldest celebration of the end of slavery and, in 2021, a federal holiday.
Sources - 1865–1877Reputable sourceWell documented
Reconstruction Begins
With the war over and slavery abolished, the nation faced the vast task of rebuilding the South and defining the place of some four million newly freed people. Congress would pass the Fourteenth and Fifteenth Amendments guaranteeing citizenship and voting rights, but Southern 'Black Codes' and violent resistance sought to preserve white supremacy.
Why it matters: Reconstruction transformed the Constitution and the meaning of American citizenship, even as its promises of equality went unfulfilled for another century.
Sources- National Park Service. Reconstruction · reference