As the United States marks the 25th anniversary of the September 11, 2001 terrorist attacks, reflections on the long-term impact of the events reveal a complex legacy that has shaped American domestic and foreign policy in enduring ways. Nearly all Americans who were old enough to remember that day recall where they were when they learned of the attacks, and a majority agree that the country has been fundamentally transformed since.
In the immediate aftermath, the U.S. launched extensive military interventions in Afghanistan and Iraq, initially receiving broad public support. However, over time, public opinion soured as the wars became prolonged and costly. Veterans of these conflicts have often expressed disillusionment similar to the wider population, fostering a critical attitude toward political leaders who oversaw these campaigns. This sentiment helped propel figures like Donald Trump, whose early presidential campaign included a strong denunciation of these wars that resonated among rank-and-file Republicans, including veterans.
Many Americans perceive that the nation’s global influence has diminished since 9/11 and attribute part of this decline to the decisions made in response to the attacks, particularly the military interventions in the Middle East. Before September 11, 2001, the U.S. enjoyed a position of unmatched post-Cold War dominance. However, the subsequent expenditures on overseas conflicts, coinciding with tax cuts, disrupted fiscal discipline and ushered in an era of mounting national debt. The last balanced federal budget was recorded in the fiscal year ending just weeks after the attacks. This fiscal trajectory has raised concerns about the country’s economic resilience both at home and abroad.
Institutionally, the government’s creation of the Department of Homeland Security aimed to consolidate counterterrorism efforts but resulted in a concentration of power that some experts warn poses ongoing risks. The broader "war on terror" precipitated controversial policies such as waterboarding and the indefinite detention without trial of terrorism suspects, which critics argue eroded international and domestic confidence in America’s commitment to rule-of-law principles. Furthermore, the response to 9/11 fueled mistrust of Muslim communities domestically and abroad, exemplified by immigration restrictions targeting Muslim-majority countries during Trump’s presidency.
On the foreign policy front, the decision to invade Iraq based on incorrect intelligence about weapons of mass destruction damaged both U.S. credibility abroad and trust among its citizens. The intense focus on Middle Eastern conflicts diverted attention and resources away from emerging strategic challenges, particularly the rise of China. Policymakers largely overlooked the economic and military implications of China’s growing influence, including its impact on American manufacturing sectors and its expanding naval capabilities.
The Trump administration’s subsequent military posture toward Iran further complicated matters by heightening tensions in the strategically crucial Strait of Hormuz, while China strengthened ties in Central Asia and the Middle East and exerted increasing pressure on U.S. allies in the Asia-Pacific region. The redeployment of significant U.S. naval forces from East Asia to the Middle East has raised concerns about American preparedness should China seek to assert control over Taiwan.
Analysts warn that unless the United States rebalances its economic, diplomatic, and military priorities, the consequences of the post-9/11 era will continue to undermine its domestic stability and international standing. Calls are growing for a strategic shift to address the pressing challenges of the coming decades, signaling an end to the era defined by the response to 9/11 and its aftermath.