Have Americans fallen out of love with invading other countries?

When the United States entered a war with Iran, the expectation in Washington was predictable. Historically, foreign conflicts have often produced a short-term rally-around-the-flag effect. Political leaders assume that once military action begins, public support will follow. Yet this time the reaction has been markedly different. Polling suggests that only a minority of Americans support the war, while large numbers remain sceptical or openly opposed.

This lack of enthusiasm reflects something deeper than the specifics of the Iran conflict itself.

Opposition to a US war on Iran is now being built from two directions at once. One is the long post-9/11 disillusionment with the “forever wars” that dominated American foreign policy for two decades. The other is far newer: the political and moral recalibration triggered by the war in Gaza and the growing scrutiny of what US backing for Israel means strategically, morally and financially.

Together, these two forces have created a political environment in which another Middle Eastern war feels not only risky but profoundly unnecessary.

The shadow of forever wars

The most powerful factor shaping American opinion today is the legacy of the “forever wars” that followed 11 September 2001. That experience fundamentally reshaped how Americans view new military interventions. This scepticism was politically visible long before the current conflict began. In fact, it was one of the themes that helped propel Donald Trump back to power.

Throughout his electoral campaign in 2024, Trump repeatedly attacked the foreign policy establishment for dragging the United States into endless wars in the Middle East. At rallies and in interviews, he promised that, if elected again, he would finally bring the era of the “forever wars” to an end.

The message resonated across party lines. Many Americans, including voters who otherwise disagreed with Trump, shared the fatigue with military interventions abroad. The promise to avoid new wars became a key part of the broader populist critique of Washington’s foreign policy consensus.

Yet the current war with Iran now appears to contradict that pledge.

This has not gone unnoticed. Critics argue that a president who campaigned on ending military entanglements in the Middle East now finds himself presiding over a new regional conflict. The political irony is stark: the very sentiment that helped bring him back to office is now fuelling opposition to the war.

The collapse of the old Iran narrative

Another reason the war struggles to gain traction is that the traditional narrative surrounding Iran no longer carries the same political weight.

For years, Washington framed Iran primarily as an imminent security threat requiring constant confrontation. But many Americans today draw a distinction between seeing Iran as a rival power and believing that war with it is necessary.

That distinction is crucial. After Iraq, the public is deeply suspicious of threat narratives that justify military intervention. When the goals of a war appear vague or shifting, support quickly erodes.

In the case of Iran, the administration’s explanations have often seemed unclear. Is the objective deterrence, dismantling Iran’s nuclear capabilities, weakening regional proxies or supporting Israel’s security strategy? The absence of a clearly defined end state reinforces public scepticism.

Americans have heard ambitious war aims before. The results did not inspire confidence.

If the post-9/11 experience explains one half of the opposition, the war in Gaza explains the other.

For decades, US support for Israel was one of the least controversial pillars of American foreign policy. That consensus has begun to fracture, particularly among younger voters and progressive Democrats. The scale of destruction in Gaza and the humanitarian crisis that followed triggered a wave of political debate in the US about the nature of the relationship with Israel.

The Iran war now unfolds against that backdrop. Many Americans increasingly interpret the US confrontation with Iran through the lens of Israel’s regional conflict.

Even prominent Democratic figures have begun to question aspects of that relationship. In March 2026, California governor Gavin Newsom sharply criticised Israel’s leadership during a public appearance in Los Angeles, warning that the country was “walking us down that path” towards what he described as an “apartheid state”. His comments reflected growing unease within parts of the American political class about the direction of Israeli politics and its implications for US policy.

Newsom also linked the war directly to domestic concerns in the US. At a time when Americans face serious economic pressures, he argued, the country should question why it is entering a costly regional conflict.

Those remarks illustrate a broader shift in political discourse. Criticism of Israeli policy, once largely confined to the margins of US politics, has become increasingly mainstream. As a result, wars connected to Israel’s regional security strategy are now far more politically contentious than they once were.

The economic question

Beyond moral and strategic debates lies a simpler concern: cost. Wars in the Middle East inevitably affect global energy markets, government spending and domestic economic stability.

Many voters worry about rising fuel prices, disruptions to global trade routes and the long-term fiscal burden of military operations. The wars in Iraq and Afghanistan left behind enormous financial commitments that continued long after the fighting itself subsided.

The Iran conflict, therefore, triggers an instinctive question among voters about what the US gains from this war. If the answer appears vague or symbolic rather than concrete, public support weakens quickly.

Perhaps the most profound shift is generational. Younger Americans grew up during the Iraq and Afghanistan wars. Their political awareness was shaped by images of those conflicts unfolding over years without clear victories. They are also the generation most engaged in the debate over Gaza and Palestinian rights.

These two experiences combine to produce a political outlook that is deeply sceptical of military intervention in the Middle East. Younger voters are less inclined to accept the traditional assumptions that once guided US foreign policy in the region.

The end of automatic war

All of this leaves the Iran conflict in an unusual position. Wars typically begin with at least some degree of political consensus. This one does not.

Support exists within parts of the Republican electorate that view Iran as a central geopolitical threat. But outside that core constituency, enthusiasm is limited. Many Democrats oppose the war outright, while independents remain wary of deeper involvement.

That fragile political foundation makes the war difficult to sustain over time. If casualties rise, economic disruption increases or war aims remain unclear, public opposition is likely to grow rather than diminish.

The deeper significance of the current debate lies beyond the Iran conflict itself. For much of the early 21st century, American foreign policy operated under an implicit assumption: that the US both could and should reshape the Middle East through military power. That assumption is now collapsing.

The trauma of the post-9/11 wars eroded faith in large-scale interventions. The Gaza war forced a reassessment of the moral and political costs of US regional alliances. Together, those developments have produced a public that is far more sceptical of military solutions in the Middle East.

That is why the war on Iran is unpopular. Not simply because Americans dislike this particular conflict, but because the political foundations that once made such wars possible are steadily eroding.

Washington may still possess the military power to fight another Middle Eastern war. What it increasingly lacks is something just as important: the public’s willingness to believe that doing so will make anything better.

Hossam el-Hamalawy is an Egyptian scholar-activist in Germany, focusing on the military, policing, and labour.

Follow Hossam on X: @3arabawy

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Opinions expressed in this article remain those of the author and do not necessarily represent those of The New Arab.