What Happened
- As the 2026 US-Israel-Iran war entered its third week, analysts and historians documented the century-long arc of US-Iran relations — a relationship that began with the US as a champion of Iranian independence from British and Soviet imperialism, and has ended in open military confrontation.
- The trajectory tracks through the 1953 CIA-backed coup (Operation Ajax), the 1979 Islamic Revolution, the 444-day hostage crisis, Iran-Contra, the proxy wars of the 1980s–2010s, the JCPOA nuclear deal, and its collapse — culminating in the 2026 war.
- The history illustrates a recurring pattern: US interventions aimed at stability produced long-term instability; agreements designed to constrain Iran's ambitions created conditions for deeper grievances; and each attempt at normalisation was overtaken by events.
- Understanding this history is essential context for UPSC Mains questions on IR, the Middle East, and the evolution of the post-Cold War international order.
Static Topic Bridges
Operation Ajax (1953): The CIA-MI6 Coup Against Mossadegh
Mohammad Mosaddegh, Iran's democratically elected Prime Minister from 1951, nationalised the Anglo-Iranian Oil Company (AIOC) — a British-controlled firm that extracted Iranian oil while returning minimal revenue to Iran — triggering a major geopolitical crisis. In response, the UK (through MI6) and the US (through the CIA, in an operation codenamed TPAJAX or Operation Ajax) orchestrated a coup d'état in August 1953 that deposed Mossadegh and reinstated the absolute power of Shah Mohammad Reza Pahlavi. The US rationale was Cold War-strategic: fear that Mossadegh might align with the Soviet Union and give Moscow influence over Iranian oil. The Anglo-Iranian Oil Company was subsequently renamed British Petroleum (BP). The coup became a foundational grievance in Iranian political memory, fuelling the 1979 Revolution and remaining a source of anti-American sentiment for generations.
- Mossadegh elected: 1951; nationalised AIOC: May 1951
- Operation Ajax/TPAJAX: CIA + MI6 joint operation; coup executed August 19, 1953
- Shah restored: Mohammad Reza Pahlavi; ruled as US-backed autocrat until 1979
- Anglo-Iranian Oil Company → renamed British Petroleum (BP) after nationalisation crisis
- US rationale: Prevent Soviet access to Iranian oil; Cold War containment logic
- Long-term consequence: The 1979 Revolution's anti-American character was directly rooted in the memory of 1953
Connection to this news: The 2026 war represents the latest chapter in a 70-year adversarial relationship whose roots lie in the 1953 coup — an event that is explicitly cited in Iranian political discourse as evidence that US engagement with Iran has always prioritised strategic interests over Iranian self-determination.
The 1979 Iranian Revolution and Hostage Crisis
The Islamic Revolution of February 1979 overthrew Shah Pahlavi's Westernised, US-backed monarchy and replaced it with the Islamic Republic under Ayatollah Ruhollah Khomeini, who institutionalised the concept of Wilayat al-Faqih (rule of the Islamic jurist). On 4 November 1979, radical students stormed the US Embassy in Tehran, taking 66 American diplomats and civilian personnel hostage — a 444-day crisis (ending 20 January 1981) that permanently ruptured US-Iran diplomatic relations. The hostage crisis coincided with the Iran-Iraq War (1980–1988), during which the US ironically provided intelligence and weapons to Saddam Hussein's Iraq against Iran, further deepening Iranian grievances. Formal US-Iran diplomatic relations have not been restored since 1980.
- Revolution: February 1979; Khomeini returned from Paris exile on 1 February 1979
- Wilayat al-Faqih: Political theory — the supreme Islamic jurist governs the state; institutionalised in Iran's constitution
- Hostage crisis: 4 November 1979 – 20 January 1981; 66 Americans held; 52 held for 444 days
- Diplomatic break: US severed relations with Iran in April 1980; not restored since
- Iran-Iraq War (1980–1988): US backed Iraq; Iran suffered 300,000–500,000 military dead
Connection to this news: The absence of diplomatic relations for over 45 years — a consequence of the 1979 hostage crisis — meant there was no direct US-Iran communication channel to de-escalate tensions before the 2026 war. The structural legacy of 1979 made conflict more likely by eliminating normal diplomatic guardrails.
JCPOA and the "Maximum Pressure" Cycle
The Joint Comprehensive Plan of Action (JCPOA), concluded on 14 July 2015 in Vienna, represented the most ambitious attempt since 1979 to reintegrate Iran into the international system through a nuclear-for-sanctions-relief bargain. Iran agreed to: reduce its enriched uranium stockpile by 97%; cap enrichment at 3.67% purity; dismantle the Arak heavy-water reactor; and submit to intrusive IAEA inspections. In exchange, the US, EU, and UN removed nuclear-related sanctions. President Trump withdrew the US from JCPOA on 8 May 2018, reinstating and expanding sanctions under a "maximum pressure" strategy. By 2023, Iran had enriched uranium to 60% purity; by early 2025, its breakout time to one bomb's worth of weapons-grade material had collapsed from roughly one year to a matter of weeks. The JCPOA's collapse is the proximate cause of the proliferation threat that motivated the 2026 US-Israeli military campaign.
- JCPOA signed: 14 July 2015; parties: P5+1 (US, UK, France, Russia, China + Germany) and EU + Iran
- P5+1: The five UN Security Council permanent members plus Germany
- US withdrawal: 8 May 2018; "maximum pressure" campaign reimposed and expanded sanctions
- Iran's response: Progressive abandonment of JCPOA commitments from July 2019
- Enrichment by 2023: 60% purity (vs 3.67% JCPOA ceiling; 90% = weapons-grade)
- Breakout time: From ~1 year under JCPOA → weeks by 2025
Connection to this news: The historical arc of JCPOA's negotiation, collapse, and the subsequent US resort to military force illustrates a recurring dilemma in US-Iran relations: diplomatic agreements that reduce immediate threats require sustained US commitment to deliver; when that commitment fractures, Iran's strategic response typically accelerates the very threat the agreement was designed to prevent.
Key Facts & Data
- Operation Ajax: August 1953; CIA + MI6 coup deposed Prime Minister Mossadegh; Shah restored
- Anglo-Iranian Oil Company nationalised 1951; company later renamed British Petroleum (BP)
- Iran hostage crisis: 4 November 1979 – 20 January 1981; 444 days; 52 Americans held
- US-Iran diplomatic break: April 1980; no formal relations restored since
- Iran-Iraq War: 1980–1988; US supported Iraq; 300,000–500,000 Iranian military casualties
- Iran-Contra Affair: 1986–1987 — the Reagan administration secretly sold arms to Iran (violating its own embargo) to fund Nicaraguan Contras, undermining US Iran policy credibility
- JCPOA: Signed 14 July 2015; US withdrew 8 May 2018
- Iran's uranium enrichment: Reached 60% by 2023 (vs 3.67% JCPOA limit; 90% = weapons-grade)
- Formal US-Iran hostilities: 2026 war began 28 February 2026; killed Supreme Leader Khamenei