The recent conflict in Iran has underscored several significant lessons regarding U.S. foreign policy and military engagement in the region. The war, which concluded earlier this year, failed to achieve its broader strategic objectives and left enduring challenges for American policymakers.

During the conflict, the United States expended a substantial portion of its critical munitions, including long-range missiles vital for deterrence against major powers such as China and Russia. Restocking these supplies is expected to take several years, potentially extending into the next administration. Domestically, the disruption of shipping through the Strait of Hormuz led to elevated energy prices, eroding wage gains experienced in prior years and impacting the overall economy.

From a military standpoint, Iran’s offensive capabilities were significantly degraded, with estimates suggesting that approximately half of its missile launchers and drones were destroyed. Despite this, Iran’s ability to rebuild its arsenal remains viable, especially with potential economic relief following the conflict and support from allies such as China and Russia. Notably, the war strengthened the position of the Islamic Revolutionary Guard Corps (IRGC), which now wields greater influence within Iran’s government. The regime’s survival through this period appears to have increased its incentive to pursue nuclear capabilities.

One central takeaway from the conflict is the inherent difficulty of pursuing regime change through military means. The campaign revived a strategy that previous U.S. administrations found fraught with challenges, as seen in Iraq in the early 2000s. The initial rationale for the conflict was linked in part to Iran’s suppression of widespread protests earlier in the year and an apparent U.S.-Israeli desire to dismantle Iran’s political leadership. However, the failure to achieve regime change led to a prolonged engagement with ambiguous goals and significant unintended consequences, including Iran’s decision to close the Strait of Hormuz—a move not seen in the more limited 12-day confrontation the previous year.

The conflict also highlighted key constraints on U.S. military and political capacity. Militarily, sustained air and naval operations depleted stockpiles of precision munitions, increasing vulnerability to counterattack. Politically, public tolerance for a war driving up domestic costs was limited, especially ahead of upcoming elections. The cessation of hostilities was accompanied by an agreement allowing Iran to reopen the Strait in exchange for easing sanctions, reflecting the balance struck under these constraints.

Moreover, the war's conduct raised questions about adherence to constitutional wartime authorities. The executive branch, under President Trump, assumed unilateral control over the initiation and management of the conflict without formal congressional authorization. Critics argue this bypassed essential political debate concerning the war’s aims and risks, such as the implications of removing Iran’s leadership and the likelihood of Iran closing a vital maritime chokepoint. The absence of legislative engagement limited public scrutiny of these strategic decisions.

The Iran conflict serves as a cautionary example of the complexities involved in military interventions aimed at political transformation, the limits of U.S. military power, and the importance of maintaining constitutional checks in decisions of war and peace. Moving forward, these lessons may influence the framing and conduct of American foreign policy in the Middle East and beyond.