More than two decades after the September 11, 2001 attacks, the United States faces a foreign policy landscape that differs markedly from the era before the attacks, reflecting profound shifts in governance, military priorities, and international alliances. While the operation that resulted in the death of Osama bin Laden stands as a notable success and the U.S. has avoided another large-scale terrorist attack on its soil, the long-term changes to American foreign policy and government structure have been substantial.

In the immediate aftermath of 9/11, Congress swiftly enacted the Authorization for Use of Military Force (AUMF) with only a single dissenting vote. This legislation granted the president broad powers to take military action against those responsible for the attacks and those harboring them. Although key figures such as bin Laden have since been killed or captured, Congress has yet to rescind the AUMF, effectively enabling a prolonged state of military engagement.

The allocation of government resources has also shifted dramatically. Whereas in 2001 the defense budget was roughly 13 times larger than spending on the State Department and foreign aid combined, more recent proposals have taken this disparity to new heights. The Trump administration’s latest defense budget request approached $1.5 trillion, representing nearly a 50% increase from the prior year, while simultaneously proposing cuts exceeding 80% to the budgets of the State Department, foreign aid, and USAID. Had Congress approved these cuts in full, the defense-to-diplomacy spending ratio would have neared 100-to-1.

These budgetary choices have coincided with a prolonged period of fiscal deficits that began after 9/11, ending a brief era of balanced budgets and surpluses during the late 1990s. Despite major economic shocks including the 2008 financial crisis and the COVID-19 pandemic, which contributed to increased deficits, there has been no sustained effort to restore fiscal balance. National debt has surpassed $40 trillion, the highest level relative to the size of the economy since World War II.

Internationally, the initial global solidarity that followed the attacks has frayed. NATO invoked Article 5—the collective defense clause—for the first time in its history, with allies sending troops to support U.S. efforts in Afghanistan. However, divergent views on subsequent military interventions, notably the Iraq war, and disputes over defense spending have strained relationships. Efforts by European members to increase defense budgets have been met with U.S. tariffs, political disputes, and a perceived retreat from commitments such as robust support for Ukraine. Recent U.S. military actions in the Middle East, including operations in Iran, have proceeded without broad consultation with allies, further isolating the country on the global stage.

For younger Americans, these developments have created a foreign policy environment unlike anything their predecessors experienced. They have not witnessed Congress authorizing a formal declaration of war, observed an administration balancing the federal budget, or seen a well-resourced diplomacy apparatus in action. Instead, they contend with heightened military expenditure, weakened diplomatic institutions, persistent national debt, and strained alliances. Observers warn that these trends represent a departure from past norms, raising questions about the future trajectory of American foreign policy.