In January 1979, the Shah of Iran — the West's closest non-Western ally, ruler of an oil-rich, militarily powerful, modernizing state armed and feted by Washington — left his country on a 'vacation' from which he would never return. Two weeks later, an exiled Shia cleric named Ayatollah Khomeini flew home from a Paris suburb to a roaring crowd of millions and announced an Islamic Republic. The Shah's secret police, the SAVAK, had jailed and tortured dissidents for years; his White Revolution had modernized from the top down and alienated clergy, bazaar, and poor alike. It was the first time in the modern era that a major state had been remade in the name of religion rather than nation, ideology, or class.
The revolution had an ecumenical coalition behind it — secular liberals, Marxist guerrillas, bazaaris, women's-rights activists, students — united more by hatred of the Shah than by any shared vision. Mass strikes, above all in the oilfields, had paralyzed the state through 1978, and cassette tapes of Khomeini's sermons smuggled in from exile gave the movement a voice the SAVAK could not silence. Within two years, Khomeini's clerical faction had outmaneuvered, purged, exiled, or executed the rest, and installed a constitution built on velayat-e faqih, the guardianship of the jurist, that combined elected institutions with a Supreme Leader's veto over them — a structure that has proved remarkably durable. The new regime seized the U.S. embassy and held fifty-two Americans for 444 days, destroying Jimmy Carter's presidency; fought an eight-year war against Saddam Hussein's Iraq, who invaded in 1980 expecting easy gains, that killed perhaps a million people and entrenched the Revolutionary Guard at the heart of the state and economy; built and armed Hezbollah in Lebanon and backed Hamas; pursued a nuclear program that has been the subject of forty years of negotiation, sabotage, and sanctions; and presents itself as the defender of Shia Muslims worldwide — a self-conception that has produced a regional cold war with Sunni Saudi Arabia waged by proxy from Yemen to Syria to Lebanon. Inside Iran, the revolution's promises of social justice and independence have been substantially betrayed; the Green Movement of 2009, the 2019 fuel protests, and the 2022 Woman, Life, Freedom uprising were each met with lethal crackdowns.
The Iranian Revolution is the prior the Middle East has been operating under for nearly half a century. Almost every regional crisis — Lebanon, Syria, Iraq, Yemen, the Israel-Hamas war, the Iranian nuclear question, the direct Iran-Israel strikes of 2024 — runs through 1979. A regime that built its legitimacy on anti-Americanism and Shia clerical rule has outlived nearly every Western prediction of its imminent collapse, even as its founding generation ages, its proxy network frays under Israeli pressure, and its own population, much of it born after the revolution, grows visibly estranged from it.