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Iranian Revolution
1978–1979· Event· Middle East & Africa
Well documentedSolid records, physical evidence or scientific consensus.
Mass protests in 1978–79 overthrew Iran's US-backed monarch, the shah, and created an Islamic Republic led by Ayatollah Khomeini.
See it on the History map →What happened
Shah Mohammad Reza Pahlavi, kept in power by a US- and British-backed coup in 1953, modernized Iran but ruled through a feared secret police, SAVAK. Oil-boom inflation, inequality and repression angered clerics, students, workers and bazaar merchants. Millions marched in 1978. The shah fled in January 1979, and the exiled cleric Ruhollah Khomeini returned. A referendum created an Islamic Republic, and in November students seized the US embassy, holding 52 Americans for 444 days.
Why it matters
It created the first modern state run by Shia clergy, turned Iran from US ally to adversary, and energized political Islam across the region.
How we know
Press coverage, declassified US and British records (including on the 1953 coup), Iranian documents, and memoirs from the shah's officials and from revolutionaries.
Still debated
Why a broad coalition of leftists, liberals and Islamists ended in clerical rule, and whether that outcome was inevitable, is still debated.
Connections (2)
▸Sunni–Shia split shaped the Shia identity of the Iranian RevolutionWell documented
The connection
Shia Muslims hold that leadership belonged to the Prophet's family and their imams; Twelvers believe the 12th imam went into hiding in 874, and clerics guide believers in his absence. Iran became Shia under the Safavids from 1501. Khomeini extended that guidance into clerical rule, and protesters used the imagery of Hussein's martyrdom at Karbala against the shah.
When and how
Khomeini set out his theory of 'guardianship of the jurist' in lectures in Najaf, Iraq, in 1970; 1978 protests followed the Shia cycle of 40-day mourning.
How we know
Khomeini's writings, revolutionary slogans and posters invoking Hussein and Karbala, and Iran's 1979 constitution, which makes Twelver Shia Islam the state religion.
Debates and open questions
Many senior Shia clerics rejected direct clerical rule, then and now. How religious the revolution was, versus nationalist and economic, is debated.
▸Iranian Revolution overthrew a US-backed shah during the Cold WarWell documented
The connection
The shah was a key US ally, armed to guard the Persian Gulf and its oil against Soviet influence. His fall cost Washington a pillar of its Cold War strategy. The new regime rejected both camps, 'Neither East nor West', but the hostage crisis and the Soviet invasion of neighboring Afghanistan in 1979 deepened US fears for the Gulf.
When and how
Tehran, 1979; in January 1980 President Carter declared the Gulf a vital US interest, the Carter Doctrine.
How we know
US records show the shah's central place in American strategy; Khomeini's slogan 'Neither East nor West' is well documented.
Debates and open questions
How much the 1953 US-backed coup fed the revolution's anti-Americanism, and whether Washington could have saved the shah, are debated.