Britain and the Soviet Union Depose Reza Shah
A neutral country's railway becomes a wartime supply line, and its king becomes a prisoner
Quick facts
- Invasion began
- August 1941
- Reza Shah abdicated
- September 16, 1941
- Occupying powers
- Britain and the Soviet Union
- Successor
- Mohammad Reza Pahlavi
What happened
In August 1941, British and Soviet forces jointly invaded and occupied officially neutral Iran, aiming to secure Iranian oil fields and open a supply corridor for American and British aid reaching the Soviet Union after Germany's invasion earlier that summer. On September 11, 1941, the British envoy to Tehran demanded the immediate removal of Reza Shah in favor of his son, Crown Prince Mohammad Reza Pahlavi, who was seen as more pliable toward British interests. Five days later, on September 16, Reza Shah abdicated and went into exile; he was taken into British custody and exiled first to Mauritius and later South Africa, where he died in 1944, while his son took the oath as the new shah the following day.
Why it matters
The invasion demonstrated, in stark terms, that Iran's independence remained conditional on great-power tolerance even after two decades of Reza Shah's state-building. It also installed the young, initially weak Mohammad Reza Shah on the throne he would occupy until the 1979 revolution, and it left a lasting Iranian memory that foreign powers could and would decide who ruled the country.
How we know
The 1941 invasion and Reza Shah's forced abdication are documented in British and American diplomatic and military records of the period, and analyzed by historians in institutional retrospectives on the episode.
Sources
- United States Holocaust Memorial Museum, Holocaust Encyclopedia. Iran During World War II · Reputable sourceencyclopedia.ushmm.org · The domain "encyclopedia.ushmm.org" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
- Wilson Center. The Fall of Reza Shah: The Abdication, Exile, and Death of Modern Iran's Founder · General sourcewilsoncenter.org · Cited as a "reference" source (no stronger domain match). · Link is live and its text matches the event's key terms (Jul 2026)
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Part of a timelineHistory of Iran27 events · A conquest that could not erase a language, a shah deposed by a CIA cable, and a revolution that replaced a crown with a clericView all →