Why Seven US Presidents Avoided War With Iran, and What the 2026 Midterms Show

Did seven US presidents really avoid war with Iran?

Yes, in the sense that no US president from Carter to Biden launched a sustained war against Iran. The record includes a failed rescue mission, naval clashes, covert sabotage and decades of sanctions. However, every president who faced a crisis with Iran stopped short of a full war. That changed on 28 February 2026, when the United States and Israel attacked Iran ^[1].

The reasons varied. Military planners warned about the risks, and allies were divided. Iran's ability to close the Strait of Hormuz threatened the world's oil supply. One factor appears in every administration, however: a war in the Gulf could cost a president politically at home. On 3 November 2026 that risk became reality. In exit polls, 74% of voters said the Iran war was a crucial or major factor in their vote, and Republicans lost both chambers of Congress ^[2].

Carter: the hostage crisis and the 1980 landslide

On 4 November 1979, students supporting the revolution seized the US embassy in Tehran and held 52 Americans for 444 days ^[3]. Carter's measured response initially helped him in the polls. As the crisis dragged on toward election day, however, it became a political liability ^[4].

In April 1980 Carter approved Operation Eagle Claw, a mission to rescue the hostages. It failed in the Iranian desert when a helicopter collided with a transport aircraft, killing eight US servicemen ^[5]. According to the Atlanta Journal-Constitution, the crisis made Carter's administration look weak, and his presidency never recovered ^[6]. Reagan won in November by 489 electoral votes to 49 ^[4]. The hostages were released on 20 January 1981, the day Reagan took office ^[6].

Carter considered a limited military operation, not a war, and paid a heavy political price for its failure. Every later president had the 1980 election in mind when dealing with Iran.

Reagan: a one-day naval battle and the Iran-Contra scandal

Reagan's experience with Iran shows how politically sensitive the subject was. The Iran-Contra affair, involving secret arms sales to Iran partly intended to free US hostages in Lebanon, caused what the New York Times and CBS News described as the largest single drop in approval for any president, from 67% to 46% in November 1986 ^[7].

In the Gulf, Reagan used force but kept it limited. Under Operation Earnest Will, the US Navy escorted Kuwaiti tankers through the Gulf during the Iran–Iraq War ^[8]. After the frigate USS Samuel B. Roberts struck a mine, the United States attacked Iranian naval targets on 18 April 1988 ^[9]. Operation Praying Mantis was the largest of the US Navy's five major surface engagements since the Second World War, but it lasted one day and did not grow into a wider war ^[9]. In July 1988 the USS Vincennes shot down Iran Air Flight 655 by mistake, killing all 290 people on board ^[10]. Even then, Washington did not escalate further.

George H. W. Bush and Clinton: goodwill gestures, then containment

In his inaugural address in January 1989, George H. W. Bush said that "goodwill begets goodwill", hoping Iran would help free the remaining hostages in Lebanon ^[11]. Bill Clinton chose economic pressure instead of military action. In April 1995 he banned US companies from all oil and trade dealings with Iran ^[11]. Washington called the approach "dual containment" of Iran and Iraq. It meant pressure without war.

Writing in 2019, Oil & Gas 360 noted that the first Gulf War against Iraq ended quickly enough that the elder Bush did not suffer politically for it ^[12]. However, as support for the Iraq war fell in 2005 and 2006, the "No Blood for Oil" slogan showed how quickly a war in the Gulf could turn voters against a president ^[12].

George W. Bush: Iraq, the 'grand bargain' and the 2006 wave

In 2003, according to Reason, a Swiss diplomat passed on an Iranian proposal for a "grand bargain": inspections of nuclear sites and cooperation on Iraq and regional issues in exchange for normal relations ^[13]. The Bush administration turned it down, believing more pressure would produce a better offer ^[13]. Even so, Bush did not attack Iran.

By then the Iraq war had become the administration's main political problem. In the 2006 midterms, dissatisfaction with the war and with the economy helped Democrats gain six Senate seats and 31 House seats and win both chambers ^[14]. Another war with Iran was not politically possible after that result.

Obama and Biden: diplomacy or some form of war

Barack Obama explained his choice to the public in 2015: "The choice we face is ultimately between diplomacy or some form of war" ^[15]. The nuclear agreement with Iran, the JCPOA, lifted sanctions in exchange for limits on Iran's nuclear programme ^[13]. It was opposed in Congress and by Israel, and an NBC/Wall Street Journal poll at the time found Americans almost evenly divided on it ^[15].

Joe Biden tried to revive the agreement after the first Trump administration left it. When the talks in Vienna stalled, his administration increased sanctions instead of using force ^[11]. Donald Trump's own first term followed a similar pattern. In January 2020 he ordered the killing of General Qasem Soleimani, but did not escalate after Iran fired missiles at US troops in Iraq, after which about 50 US service members were diagnosed with brain injuries ^[16].

The common thread: votes and gasoline prices

Across these 46 years, war with Iran carried two linked political risks:

• A crisis that could not be ended quickly. Carter's hostage crisis and Bush's war in Iraq both became long ordeals, and voters blamed the party in power ^[4,14].
• The price of gasoline. Iran borders the Strait of Hormuz. Oil & Gas 360 argued in 2019 that oil was probably "the reason we won't go to war with Iran" ^[12]. A war risked a price shock that voters would feel immediately.

Some argue that this restraint weakened over time. Reason contends that hawks in both parties spent decades making war "politically easier" than compromise ^[13]. The 2026 war shows what happens when both risks occur together.

What 2026 shows

The war began on 28 February 2026, and the Strait of Hormuz was closed on 4 March ^[17]. Brent crude rose from $72.48 to a peak of $118.35 on 31 March ^[17]. The war was expected to be short but lasted more than eight months. By election day most voters considered it a mistake. In NBC's exit poll, 63% called military action against Iran the wrong decision ^[18]. In CNN's poll, 87% were concerned about gasoline prices ^[2].

Republicans lost the Senate and the House, including seats in Texas, Kansas and South Carolina ^[19]. President Trump said that "a part of it was Iran" ^[19]. The result is the clearest evidence since 1980 that war with Iran can be very costly politically for a US president.

For the energy markets, the lesson is that domestic politics limit how far the United States will go in a Gulf conflict, and the new Congress makes that limit stronger. Our analysis of the midterms and oil prices sets out what this could mean for Brent and Hormuz.