100 Years of Iranian History

The Qajar Decline (1900s–1925)

By the early 20th century, the Qajar dynasty had ruled Persia for over a century but had lost effective control over much of the country. The Constitutional Revolution of 1905–1911 established Iran's first parliament (Majlis) and constitution, but foreign interference — particularly from Britain and Russia — undermined sovereignty.

The Anglo-Russian Convention of 1907 divided Iran into spheres of influence without Iranian consent. During World War I, Iran declared neutrality but was occupied by British, Russian, and Ottoman forces. The discovery of oil at Masjed Soleyman in 1908 by the Anglo-Persian Oil Company (later BP) transformed Iran's strategic significance, making it a prize for colonial powers.

By 1920, the Qajar government was financially bankrupt and politically impotent. The Anglo-Persian Agreement of 1919, which would have made Iran a virtual British protectorate, was rejected by the Majlis. This period of weakness set the stage for military strongman Reza Khan's rise to power.

Reza Shah Pahlavi (1925–1941)

Reza Khan, commander of the Persian Cossack Brigade, seized power in a 1921 coup and crowned himself Reza Shah Pahlavi in 1925, founding the Pahlavi dynasty. His reign was defined by aggressive modernization modeled on Atatürk's Turkey.

Key Reforms

• Trans-Iranian Railway — A 1,394 km rail line connecting the Caspian Sea to the Persian Gulf, built between 1927–1938
• Secularization — Abolished the veil mandate (Kashf-e Hijab, 1936), established civil courts over religious courts
• Education — Founded the University of Tehran (1934), expanded primary education
• Name change — Formally changed the country's name from Persia to Iran in 1935
• Military modernization — Created a centralized national army, suppressing tribal autonomy

However, Reza Shah's authoritarian rule suppressed political opposition and free press. His flirtation with Nazi Germany during World War II proved fatal — the Anglo-Soviet invasion of Iran in August 1941 forced his abdication in favor of his 21-year-old son, Mohammad Reza Pahlavi.

Mohammad Reza Shah — Early Reign (1941–1953)

The young Mohammad Reza Shah inherited a weakened throne during wartime occupation. Iran became a critical supply corridor for Allied lend-lease shipments to the Soviet Union (the "Persian Corridor"). The occupation sparked political awakening — multiple parties emerged, including the communist Tudeh Party and nationalist movements.

The postwar era brought the Azerbaijan Crisis of 1946, considered by some historians as the first crisis of the Cold War, when Soviet-backed separatists declared an autonomous republic in Iranian Azerbaijan. Under Western pressure, the Soviets withdrew, and Iran reasserted control.

The most consequential figure of this period was Mohammad Mossadegh, who rose to prominence on the oil nationalization movement.

The Mossadegh Era and 1953 Coup

In 1951, the Majlis appointed Mohammad Mossadegh as Prime Minister. His signature act — nationalizing the Anglo-Iranian Oil Company — sent shockwaves through the Western world. Britain responded with a crippling economic blockade and covert destabilization campaign.

In August 1953, the CIA (Operation AJAX) and MI6 (Operation Boot) orchestrated a coup that removed Mossadegh from power and restored the Shah to full authority. The coup's key elements included:

• Propaganda campaigns in Iranian media, funded by CIA officer Kermit Roosevelt Jr.
• Bribery of military officers and political figures
• Organized street demonstrations using hired provocateurs
• Initial failure on August 15 (the Shah briefly fled to Baghdad then Rome)
• Successful second attempt on August 19, with military units loyal to the Shah arresting Mossadegh

The White Revolution and SAVAK Era (1963–1979)

With American backing, the Shah launched the White Revolution in 1963 — a sweeping modernization program that included:

• Land reform — Redistributed large estates to peasant farmers
• Women's suffrage — Granted in 1963
• Literacy Corps — Sent educated youth to rural areas as teachers
• Industrial expansion — Major investment in steel, petrochemicals, automotive
• Health and infrastructure — Expanded hospitals, roads, dams

The reforms generated significant economic growth but also massive inequality. Rapid urbanization displaced rural populations. The Shah's secret police, SAVAK (established 1957 with CIA and Mossad assistance), ruthlessly suppressed dissent. Amnesty International documented widespread torture, arbitrary detention, and political assassinations.

Oil Boom and Bust

The 1973 oil embargo quadrupled global oil prices, flooding Iran with petrodollars. The Shah embarked on lavish military spending — Iran became the largest purchaser of American arms, acquiring F-14 Tomcats, Chieftain tanks, and naval vessels. The extravagant Persepolis celebration of 1971 (marking 2,500 years of Persian monarchy) cost an estimated $200 million and symbolized the regime's disconnect from ordinary Iranians.

By the mid-1970s, inflation, corruption, and cultural dislocation fueled growing opposition from multiple factions: leftists, nationalists, bazaar merchants, and most critically, the Shia clergy led by Ayatollah Ruhollah Khomeini, who had been exiled to Iraq in 1964 and later moved to France.

The Islamic Revolution (1979)

The revolution that toppled the Pahlavi dynasty was one of the most consequential events of the 20th century. For detailed analysis, see the dedicated Revolution page.

Key Milestones

The Iran-Iraq War (1980–1988)

On September 22, 1980, Iraqi forces under Saddam Hussein invaded Iran, launching the longest conventional war of the 20th century. The conflict shaped Iran's military doctrine, regional strategy, and national identity in ways that persist to 2026.

Key Phases

Legacy

• Casualties: Estimated 500,000–1,000,000 killed on both sides; hundreds of thousands wounded
• Chemical weapons: Iraq used mustard gas and nerve agents against Iranian troops and Kurdish civilians (Halabja, 1988); ~100,000 Iranian veterans still suffer effects
• IRGC formation: The Islamic Revolutionary Guard Corps (IRGC), formed in 1979, was battle-hardened and became a parallel military and economic power
• Basij mobilization: Volunteer militia recruited from young men and boys; became a permanent institution
• Strategic doctrine: Iran concluded it could never rely on foreign allies and must develop indigenous military capabilities — the foundation for its missile and proxy strategies
• Western betrayal narrative: Western nations (especially the US) supported Iraq during the war; this reinforced Iranian distrust of the West

Reconstruction and Reform (1989–2002)

Khomeini's death in June 1989 brought Ayatollah Ali Khamenei to the position of Supreme Leader. President Akbar Hashemi Rafsanjani (1989–1997) focused on economic reconstruction, pragmatic diplomacy, and rebuilding war-damaged infrastructure.

The election of reformist Mohammad Khatami in 1997 raised hopes for political liberalization. Khatami's "Dialogue Among Civilizations" approach improved relations with Europe and briefly thawed tensions with the US. However, hardline institutions — the Guardian Council, judiciary, and IRGC — blocked most reform initiatives.

Key Developments

• IRGC economic expansion: The Revolutionary Guards moved into construction, telecommunications, oil, and banking, becoming Iran's largest economic conglomerate
• Proxy network building: Iran deepened support for Hezbollah in Lebanon, Hamas in Palestine, and Shia militias in Iraq
• Covert nuclear program: Iran began undeclared uranium enrichment activities, later revealed by opposition groups in 2002
• Student movement: The 1999 Tehran student protests signaled growing internal discontent with clerical rule

The Nuclear Crisis (2002–2015)

In August 2002, the Iranian exile group Mujahedin-e Khalq (MEK) revealed the existence of undeclared nuclear facilities at Natanz (enrichment) and Arak (heavy water reactor). This triggered a decade-long international crisis.

Key Events

JCPOA to the 2026 Conflict

The Nuclear Deal (2015–2018)

The Joint Comprehensive Plan of Action (JCPOA), signed July 14, 2015, was a landmark agreement between Iran and the P5+1 (US, UK, France, Russia, China, Germany). Iran agreed to limit enrichment to 3.67%, reduce centrifuges, and accept intrusive inspections. In return, nuclear-related sanctions were lifted.

The Unraveling