Twenty-Five Years After 9/11, Mark Esper Weighs America's Strategic Triumphs and Missteps

Looking back across a quarter-century of sweeping global engagement and military intervention, former U.S. Defense Secretary Mark Esper has offered a sobering assessment of Washington's post-9/11 foreign policy. Speaking in an interview with Ian Bremmer on GZERO World, the former Pentagon chief examined the profound transformations triggered by the September 11, 2001 terrorist attacks, evaluating where the nation succeeded and where its strategic vision faltered.

The cataclysmic events of 9/11 marked a definitive turning point in modern American history, fundamentally altering the trajectory of the country's domestic politics, international standing, and defense strategy. In the wake of the attacks, the United States embarked on expansive military campaigns in Afghanistan and Iraq while rapidly engineering a vast expansion of its domestic and international security apparatus.

Prior to the strikes on New York and Washington, the American public largely operated under the comforting assumption that the nation was geographically insulated and fundamentally secure. According to Esper, the attacks violently dismantled that sense of invulnerability, forcing the public and policymakers alike to confront acute vulnerabilities that had long been overlooked.

One of the primary positive lessons derived from the immediate aftermath was the indispensable need for national vigilance. Esper highlighted that maintaining a heightened awareness of emerging dangers remains essential for safeguarding the homeland against unconventional threats that do not adhere to traditional borders or conventional rules of engagement.

However, alongside the imperative of vigilance came significant strategic miscalculations. Esper warned that the decades following the attacks serve as a stark reminder of the inherent limits of national power, illustrating how easily American foreign policy can drift into dangerous overreach when driven by broad, open-ended mandates.

This overreach became particularly evident during the prolonged military engagement in Afghanistan. Esper pointed to the campaign as a prime example of the peril of confusing overwhelming military capability with achievable political outcomes, noting that battlefield superiority does not automatically translate into enduring political stability.

The conflict exposed the profound flaws in attempting to reconstruct and modernize an entire foreign society through sheer military force. By setting objectives that exceeded the realistic potential of armed intervention, policymakers found themselves entrenched in prolonged nation-building efforts that failed to yield sustainable governance structures.

Beyond the battlefield, the aftermath of 9/11 drove an unprecedented growth in government surveillance, intelligence operations, and homeland defense institutions. This sweeping expansion of the national security state reshaped the relationship between the government and its citizens, raising long-term questions about oversight and institutional momentum.

Esper noted that this institutional expansion brought serious internal risks, chief among them the potential erosion of foundational civil liberties. In the relentless pursuit of total safety, the nation faced the ongoing danger of compromising the very democratic principles and constitutional protections it was striving to defend.

In addition to domestic civil liberties concerns, the intense, decades-long focus on counterterrorism created severe geopolitical blind spots. Esper argued that by directing immense financial, intelligence, and military capital toward fighting non-state actors in the Middle East, the United States diverted crucial attention away from more formidable long-term challenges.

Most prominent among these neglected challenges was the rapid rise of China. As Washington remained consumed by protracted conflicts in the Middle East and Central Asia, Beijing steadily expanded its economic influence, modernized its military capabilities, and positioned itself as a primary global competitor without encountering a fully focused American response.

Central to Esper's reflection is the idea that a free society cannot eradicate all foreign threats without jeopardizing its own character. He emphasized that genuine democratic strength requires accepting an unavoidable baseline of risk, warning against enacting policy out of panic or fear.

Esper underscored that what truly underpins American power and resilience is its democratic framework and core institutional values. Forgetting these principles in moments of crisis, he noted, undermines the moral and political foundation that defines the nation on the world stage.

A quarter of a century after the attacks reshaped the global order, Esper's retrospective serves as both a critique of past excesses and a blueprint for future policy. As new geopolitical rivalries intensify, the essential challenge remains learning to balance proactive defense with strategic restraint, ensuring that the defense of democracy does not inadvertently dismantle the freedoms that give it purpose.