This article is part of TPM Cafe, TPM’s home for opinion and news analysis. It was originally published at The Conversation.

It’s clear that regime change is among the biggest objectives of the U.S. war in Iran.

“I have to be involved in the appointment” of Iran’s next leader, President Donald Trump said on March 5, 2026.

Trump has also said he might put U.S. boots on the ground to get the job done.

Trump now joins a long list of modern U.S. presidents – from Franklin Roosevelt to Harry Truman, Lyndon Johnson, George W. Bush and Barack Obama – who started wars to either overthrow hostile regimes or support embattled friendly governments abroad.

For all the parallels to history, though, Trump’s Iran war is historically unique in one critically important way: In its early stages, the war is not popular with the American public.

A recent CNN poll found that 59% of Americans oppose the war – a trend found in poll after poll since the war began.

As an expert on U.S. foreign policy and regime change wars, my research shows that what’s likely generating public opposition to the Iran war today is the absence of a big story with a grand purpose that has bolstered public support for just about every major U.S.-promoted regime change war since 1900. These broad, purpose-filled narratives generate public buy-in to support the costs of war, which are often high in terms of money spent and lives lost when regime change is at stake.

Two historical examples

In the 1930s and ’40s, a widely accepted – and largely true – story about the dangers of fascism spreading and democracies........

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