The history of the US-Iran conflict is marked by a series of events that have shaped the geopolitical landscape of the Middle East. The roots of the conflict can be traced back to the early 20th century, particularly with the 1953 CIA-backed coup that overthrew Iran's democratically elected Prime Minister Mohammad Mossadegh. This event led to the establishment of the Shah's authoritarian regime, which was supported by the United States. The Shah's rule was characterized by widespread repression and human rights abuses, which fueled resentment among the Iranian populace and laid the groundwork for the 1979 Iranian Revolution. This revolution resulted in the establishment of the Islamic Republic of Iran, which was fundamentally opposed to US influence in the region and led to the severing of diplomatic ties between the two nations.
The hostage crisis that followed the revolution, where 52 American diplomats and citizens were held hostage for 444 days, further exacerbated tensions. The US responded with economic sanctions and diplomatic isolation of Iran, which continued to escalate over the years. The Iran-Iraq War (1980-1988) saw the US providing support to Iraq, further straining relations. In the 1990s, the US labeled Iran as part of the "Axis of Evil" and imposed additional sanctions, particularly in response to Iran's nuclear ambitions and its support for militant groups in the region.
The early 2000s marked a significant turning point with the US invasion of Iraq in 2003, which removed Iran's regional rival, Saddam Hussein. This shift in power dynamics allowed Iran to expand its influence in Iraq and the broader region, leading to increased tensions with the US and its allies. The nuclear issue became a focal point of the conflict, culminating in the 2015 Joint Comprehensive Plan of Action (JCPOA), an agreement aimed at curbing Iran's nuclear program in exchange for sanctions relief. However, the US withdrawal from the agreement in 2018 under the Trump administration reignited hostilities, leading to a series of confrontations, including the assassination of Iranian General Qassem Soleimani in 2020.
As of 2026, the US-Iran conflict remains unresolved, with ongoing tensions over Iran's nuclear program, its regional activities, and the impact of sanctions on the Iranian economy. The Biden administration has expressed a desire to return to negotiations regarding the nuclear deal, but significant obstacles remain, including Iran's ballistic missile program and its support for proxy groups in the region. The conflict continues to have profound implications for regional stability, US foreign policy, and the broader international community, as both nations navigate a complex web of historical grievances, strategic interests, and geopolitical rivalries.