The U.S. history of intervention in Iran is long, indirect, and highly consequential. Here’s a clear, chronological explanation of what America did in Iran and why it still matters today.
1. 1953 Coup d’état (the most important event)
What happened
Iran’s democratically elected Prime Minister Mohammad Mossadegh nationalized Iran’s oil.
The CIA (with Britain’s MI6) organized Operation Ajax.
Mossadegh was overthrown.
The Shah of Iran (Mohammad Reza Pahlavi) was restored to absolute power.
Why the U.S. intervened
Protect Western oil interests (British and U.S.)
Cold War fear that Iran might drift toward the Soviet Union
Desire for a pro-Western, stable regime
Consequences
Iran lost its democratic path
Shah ruled as an authoritarian backed by U.S.
Deep, lasting anti-American resentment
This event is often cited as the root cause of modern U.S.–Iran hostility
2. Support for the Shah (1953–1979)
What the U.S. did
Provided:
Military aid
Intelligence support
Weapons
Trained and backed SAVAK, Iran’s secret police
Why
Iran was a key U.S. ally in the Middle East
Containment of Soviet influence
Oil and regional stability
Outcome
Economic modernization for elites
Severe repression of opposition
Growing public anger
3. 1979 Iranian Revolution
What changed
Shah was overthrown
Islamic Republic established under Ayatollah Khomeini
U.S. embassy seized; 52 Americans held hostage for 444 days
U.S. role
No direct military intervention during the revolution
The crisis hardened hostility on both sides
4. Iran–Iraq War (1980–1988)
What the U.S. did
Backed Iraq (Saddam Hussein) indirectly:
Intelligence sharing
Financial facilitation
Political support
Looked away from Iraq’s use of chemical weapons
Why
Prevent Iran’s revolutionary ideology from spreading
Maintain balance of power
Consequences
Over 1 million casualties combined
Iran views this as proof the U.S. is its enemy
5. Direct military clashes (1980s)
Key incidents
Operation Praying Mantis (1988):
U.S. destroyed much of Iran’s navy in one day
Iran Air Flight 655 (1988):
U.S. warship shot down Iranian civilian airliner, killing 290 people
Impact
Deep trauma in Iran
U.S. later expressed regret, but never formally apologized
6. Sanctions & pressure (1990s–present)
What the U.S. does
Extensive economic sanctions
Cyber operations (e.g., Stuxnet attack on nuclear facilities)
Targeted killings (e.g., Qassem Soleimani in 2020)