The relationship between the United States and Iran represents one of the most enduring and complex geopolitical standoffs of the modern era. Since the 1979 Islamic Revolution, these two nations have engaged in what scholars term a 'cold war' characterised by proxy conflicts, economic warfare, and military posturing that stops just short of direct confrontation.

Historical Roots of US-Iran Tensions

The current antagonism stems from the 1979 overthrow of Shah Mohammad Reza Pahlavi, a key US ally who had been restored to power through a CIA-backed coup in 1953. The Islamic Revolution, led by Ayatollah Ruhollah Khomeini, transformed Iran from America's regional partner into its primary Middle Eastern adversary. The 444-day hostage crisis at the US Embassy in Tehran cemented this adversarial relationship in American political consciousness.

The Iran-Iraq War (1980-1988) saw the US supporting Saddam Hussein's Iraq, further poisoning relations. During this period, Iran began developing its network of regional proxies, including Hezbollah in Lebanon, as a strategic response to isolation and the existential threat posed by Iraqi chemical weapons attacks.

Nuclear Concerns and Strategic Competition

Iran's nuclear programme, officially launched in the 1950s with American assistance during the Shah's era, became a central flashpoint after 2002. US intelligence agencies and Israeli officials have consistently argued that Iran seeks nuclear weapons capability, though Iran maintains its programme is for peaceful purposes. Dr Marina Ottaway of the Middle East Institute notes, 'The nuclear issue became a convenient framework for broader US concerns about Iranian regional influence and support for non-state actors.'

The 2015 Joint Comprehensive Plan of Action (JCPOA) represented a brief détente, with Iran accepting strict limitations on its nuclear activities in exchange for sanctions relief. However, President Trump's withdrawal from the agreement in 2018 and reimposition of 'maximum pressure' sanctions marked a return to confrontational policies.

Regional Proxy Conflicts and Alliance Systems

US concerns about Iranian 'malign influence' centre on Tehran's support for armed groups across the Middle East. Iran's Revolutionary Guard Corps provides funding, training, and weapons to organisations including Hezbollah, Palestinian Islamic Jihad, Yemen's Houthis, and various Iraqi Shia militias. These relationships serve Iran's strategic goal of projecting power while maintaining plausible deniability.

Conversely, the United States has built extensive military partnerships with Iran's regional rivals, particularly Saudi Arabia and the UAE. American arms sales to Gulf monarchies totalled over $100 billion during the Trump administration alone. Professor Vali Nasr of Johns Hopkins University observes, 'The US-Iran rivalry has become institutionalised through these competing alliance networks, creating vested interests in maintaining tension.'

Economic Dimensions and Energy Politics

Iran possesses the world's fourth-largest proven oil reserves and second-largest natural gas reserves, making its potential market re-entry a significant concern for both regional producers and international energy companies. US sanctions have effectively removed Iranian oil from global markets, supporting higher prices that benefit American shale producers and Gulf allies.

The broader economic warfare includes targeting Iran's banking sector, shipping industry, and technology imports. These measures aim to constrain Iran's ability to fund regional activities while pressuring Tehran toward policy changes.

What This Means Today

Rather than seeking outright war, US policy toward Iran reflects a strategy of containment through economic pressure, military deterrence, and alliance building. The costs of direct military conflict—potentially involving Iranian retaliation against Gulf infrastructure, escalation with proxies across the region, and massive civilian casualties—have consistently deterred American presidents from authorising major strikes. However, this 'cold war' dynamic creates ongoing risks of miscalculation, as demonstrated by incidents like the 2020 assassination of Iranian general Qasem Soleimani and subsequent Iranian missile strikes on US bases in Iraq.