Mohammad Reza Shah Pahlavi ruled Iran for nearly four decades before being ousted by the revolution

The Shah fled Iran in January 1979, ending nearly 38 years of Pahlavi rule

On Jan. 16, 1979, Mohammad Reza Shah left Iran with his wife, officially for a "vacation"—one he would never return from. His departure marked the effective collapse of the monarchy, as millions celebrated in the streets and power swiftly shifted to Khomeini's revolutionary movement.

Watch contemporary footage covering the US-backed Shah of Iran fleeing the country in the face of the 1979 Iranian Revolution

Mohammad Mosaddegh was ousted in a CIA-backed coup in 1953

Iran's democratically elected prime minister, Mosaddegh, nationalized the country's oil industry in 1951, challenging British and American control of Iran's resources. The CIA and British intelligence orchestrated a coup that ousted him and reinstated the Shah, fueling decades of Iranian distrust of the West.

Ayatollah Khomeini led the ideological opposition to the Shah from exile

Exiled in 1964 for opposing a law that granted diplomatic immunity to US military personnel in Iran, Khomeini built a large following by smuggling recorded sermons into Iran on cassette tapes. He aimed to replace the monarchy with an Islamic republic governed by religious law.

Iran became a constitutional monarchy in 1906

A popular revolution forced the ruling Qajar Shah—a dynasty that had governed Iran since the late 18th century—to sign a constitution and establish a parliament, marking Iran's first major step toward democratic governance and limiting the monarchy's absolute power.

See a timeline of the events that shaped the Iranian Revolution

From a defamatory newspaper editorial that sparked protests in January 1978 to Khomeini's return from exile and the Shah's flight from Iran in 1979, this timeline traces the rapidly escalating chain of events—protests, crackdowns, and political collapses—that toppled one of the Middle East's most powerful monarchies.

Persia was officially called Iran by the international community in 1935

At the request of Reza Shah, the international community began using "Iran"—the name Iranians had always called their country—replacing the Western term "Persia." The change reflected a broader push for national identity and modernization under the Pahlavi dynasty.

The Shah used torture and other human rights abuses to maintain power before the revolution

A declassified 1976 US Embassy telegram acknowledged that the Shah held 3,400-3,500 political prisoners, documented torture allegations against the SAVAK secret police, and confirmed press censorship, even as American diplomats sought to minimize human rights concerns for Congress.

Ayatollah Khomeini returned to Iran on Feb. 1, 1979, after 14 years in exile

Greeted by millions of Iranians flooding the streets of Tehran, Khomeini's return was a defining moment of the revolution. Within days, he appointed a rival prime minister, effectively dismantling the last remnants of the Shah's government and consolidating clerical rule over the new Islamic Republic.

Ayatollah Khamenei ruled Iran for 36 years after succeeding Khomeini as Supreme Leader

When Khomeini died in 1989, Ali Khamenei was appointed acting supreme leader on the same day. He served in this position until his death in February 2026, shaping Iran for nearly four decades.

Iranians voted overwhelmingly to establish an Islamic Republic in March 1979

Just weeks after Khomeini's return, Iran held a national referendum to replace the monarchy with an Islamic Republic, and over 98% voted in favor (though the vote was criticized). The vote formalized the revolution's outcome, laying the foundation for a theocratic government that remains in place today.

Iraq invaded Iran in 1980, drawing the new Islamic Republic into a devastating eight-year war

Just a year after the revolution, Saddam Hussein invaded Iran, hoping to exploit its post-revolutionary instability. The brutal conflict killed hundreds of thousands in one of the century's deadliest conflicts and forced Khomeini's government to consolidate power.

The Iranian Revolution relied largely on nonviolent tactics

Despite thousands of unarmed protesters killed by the Shah's forces, the revolution relied overwhelmingly on nonviolent tactics, including strikes, demonstrations, and civil disobedience, with up to 9 million Iranians peacefully taking to the streets, making it one of history's largest protest movements by population percentage.

'Velayat-e faqih' is the religious doctrine that has governed Iran since the 1979 revolution

Meaning "guardianship of the Islamic jurist," the doctrine transfers all political and religious authority to the Shia clergy, with the supreme leader holding ultimate power over the state. Developed by Khomeini in the 1970s, it has served as the foundation of Iran's government since the revolution.

The 1979 Iranian Revolution inspired other Islamist movements and alarmed Sunni governments

By establishing the world's first modern Islamic theocracy, the revolution inspired Islamist movements across the region and alarmed Sunni Arab governments. The resulting rivalry between Shia Iran and Sunni Saudi Arabia has since fueled proxy conflicts in Lebanon, Iraq, Syria, and Yemen that persist today.

In 1979, Iranian students seized the US Embassy in Tehran, holding 52 Americans hostage for 444 days

Outraged by the US decision to allow the exiled Shah to enter the United States for medical treatment, student protesters stormed the embassy in November 1979. The crisis paralyzed the Carter presidency and ended with a negotiated release on the day of Ronald Reagan's inauguration.

Iran’s 1979 revolution sparked a second oil shock—and reconfigured global energy markets

Widespread strikes in Iran’s oil sector during the 1978-79 revolution slashed production and triggered panic buying, flooding oil markets with fear.

Iran's Revolutionary Guard Corps is independent of Iran's regular army and is one of the most powerful and influential military-political organizations in the Middle East.

Who was China's last emperor?

The last emperor of China's last dynasty came into power as a toddler. This article details the rise and abdication of Emperor Aisin Gioro Puyi. Puyi, also known as Henry Puyi, was forced to abdicate his throne in 1912 following the Wuchang...

The ancient succession drama that led to the Sunni-Shia divide

The split that divided Islam into its major branches comes down to succession: after Muhammad's death, Sunnis backed an elected leader, Abu Bakr, while Shia Muslims sided with a member of Muhammad's bloodline, his cousin and son-in-law Ali. That 7th-century disagreement shapes geopolitics today, Ramadan's traditions, and communities worldwide.

Stalin transformed the USSR through rapid industrialization and brutal repression

Ruling from the mid-1920s to 1953, Joseph Stalin reshaped the Soviet Union with forced collectivization, crash industrial growth, and widespread terror. His policies modernized the economy but caused mass famine, purges, and the deaths of millions.

All US presidents, by generation

Every president is a member of a generation, and Baby Boomers have held the Oval Office since 1992 (with the exception of Joe Biden, of the Silent Generation). But what about in the early days? Turns out the generation with the most presidents is the Transcendental Generation (born between 1792-1821), which includes Abraham Lincoln. Check out the full list (and what are most likely very new generational terms) with this fun overview.

After the USSR's fall, many experts believed liberal democracy had permanently prevailed

Political scientist Francis Fukuyama argued in 1992 that liberal democracy and market capitalism had defeated their ideological opponents and would eventually spread everywhere—a thesis he called "the end of history." Subsequent decades complicated that claim.

See a ranking of the best (and worst) Federal Reserve Chairs since 1914 out of the 16 men and women who have held the office since.

The power and influence of the American presidency have expanded significantly over time—far beyond what the founders envisioned.

A podcast unpacking Pakistan’s political turmoil

Pakistan has been immersed in political crises for over 20 years. Despite being one of the world’s few nuclear powers, Pakistan’s internal instability has caused experts to question whether the country is, in fact, a failed state. Deep divisions...

Ukraine's reformist candidate survived a poisoning attempt in 2004

During the 2004 presidential campaign, Viktor Yushchenko was poisoned with dioxin, which disfigured his face but did not prevent him from winning the rerun election. The attack was widely suspected to involve pro-Russian security forces.

Every world champion in F1 history

Over the last decade, Max Verstappen and Lewis Hamilton have dominated the winners podium, and their Red Bull Racing and Mercedes teams have taken every Constructors' Championship since 2010. But what team had the most championships in the 1950s? Who has the most Drivers' Championships in Formula 1's history? This article shows every Drivers' and Constructors' Champion since the start of Formula 1 in the 1950s.

The Federal Reserve is the most powerful financial institution in the US

The Fed controls the money supply, determines interest rates, and regulates the banking system. Established in 1913 after a volatile series of financial panics, the central bank has managed to retain its legitimacy despite broad critiques against its obscure and independent decision process.

The identity of the Tank Man in the iconic photo from the 1989 Tiananmen Square protests remains unknown and was possibly killed.

The United States has had a tumultuous relationship with Cuba since its 1959 revolution, highlighted by a nuclear crisis and a decades-long trade embargo.

One of the most famous portraits ever taken is 'Afghan Girl' (1984) by Steve McCurry, yet the subject Sharbat Gula went much of her life without being identified or benefitting from the image's success.

Jimmy Carter signed a 1978 bill that legalized home brewing, a move credited with kick-starting the craft beer industry.

'Shogun,' a 1980s TV series, helped popularize sushi in the US by stimulating an American interest in Japanese culture.

The name 'Silicon Valley' arose from the founding of Shockley Semiconductor Laboratory in Fairchild Semiconductor in 1956-57, founded near Stanford University in Palo Alto

Take a 3D tour of the Hajj, Islam's annual pilgrimage to Mecca, undertaken by over 1.5 million Muslims.

The hormonal disorder PCOS was renamed PMOS in 2026, a move designed to improve care and research by shifting the focus to the hormonal causes of this condition that affects 1 in 8 women.

Sunflowers have long been a symbol of nuclear disarmament because they can extract large amounts of radioactive cesium from soil.

For centuries, it was common to sleep in two shifts: a few hours at the beginning of the night, and a longer period beginning around midnight

Abraham Lincoln was almost assassinated weeks before his inauguration as he traveled from Illinois to DC through Baltimore in 1861; it took two independent claims for Lincoln to be convinced the threat was real

Fast-casual restaurant Chili's is experiencing a resurgence, with its parent company recently reporting a nearly 32% increase in sales, thanks to passionate Gen Z fans on TikTok.

The Mona Lisa's celebrity status and repeated restorations have obscured what made the painting so revolutionary for its time

Before humans, the Soviet Union and the United States sent animals—including apes, dogs, and cats—to space during the Space Race.

The term 'algorithm' originated from the Latinized name of al-Khwārizmī, a 9th-century mathematician whose works introduced Arabic numerals and the decimal-based numeral system to Europe and whose treatise 'Al-Jabr' gave algebra its name.

See how Ebola tore through Guinea, Sierra Leone, and Liberia in 2014-2016.

Salvador Dalí believed he was his own dead brother, who had died nine months before he was born

In 2026, Finland was named the world's happiest country for the ninth consecutive year based on its wealth, social safety network, and high life expectancy, among other factors.

While atoms are normally made of protons, neutrons, and electrons, exotic ones have been built with antimatter—alternate versions of normal matter that live for fractions of a second and are about a billion times as rare.

Volcanoes 'die' when their supply of magma runs out, if they are shifted away from their underlying magma reservoir, or if they get clogged by collapsing or their magma cooling back into rock.

Urushiol, the oily toxin in poison ivy, can remain allergenic on clothing for years.