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12 September 2026

How 9/11 reshaped the world: a 25-year perspective

The 2001 terror attacks marked a turning point in global history, triggering profound changes in politics, security, and societal values worldwide

How 9/11 reshaped the world: a 25-year perspective

The events of September 11, 2001, sent shockwaves around the world, marking the beginning of a new era in global politics and security. As we reflect on the 25th anniversary of these attacks, it’s clear that their impact extends far beyond the immediate tragedy, reshaping international relations, domestic policies, and societal attitudes.

While the immediate response focused on combating terrorism, the long-term consequences have been more complex and far-reaching. The attacks exposed vulnerabilities in global security systems and triggered a series of events that continue to influence world affairs today.

The decline of Islamic militancy and the rise of new challenges

The initial threat posed by Al-Qaeda and other Islamic militant groups appeared formidable, but their influence waned over time. Rather than being defeated on the battlefield, these groups struggled to gain significant support among Muslim populations. The Arab Spring of the early 2010s demonstrated this shift, as protesters across the region demanded democracy rather than religious rule.

The emergence of the Islamic State (ISIS) from within the American prison system in Iraq highlighted the complex nature of the conflict. While militant groups still operate in certain regions, their influence has diminished in many areas, giving way to new challenges such as petty crime and psychological disturbances.

The end of the Cold War and the beginning of a new era

The 9/11 attacks can be seen as the final chapter of the Cold War marking the definitive end of the bipolar world order. The institutions and practices established during the Cold War, such as NATO and the United Nations, initially appeared capable of operating without their founding cause. However, the attacks exposed the limitations of these institutions in addressing new forms of asymmetric warfare.

The war on terror rendered traditional concepts such as the balance of power and deterrence increasingly obsolete. Fought in civilian spaces against non-state actors, this conflict led to the dismantling of several ideological states in the Middle East, including Iraq, Libya, and Syria. It also weakened the liberal state, which had been a central feature of the Cold War era.

The impact on Western democracies

One of the goals of Al-Qaeda’s campaign was to provoke Western democracies into dismantling their own civil liberties. In many ways, they succeeded. The war on terror led to the widespread use of emergency powers, surveillance, indefinite detention, torture, and rendition. These measures not only weakened liberal norms but also fueled suspicion of Muslims and hostility toward immigration.

The cultural and political landscape of Europe and America today is characterized by polarization, populism, and a pervasive distrust of institutions. These trends can be traced back to the response to the 9/11 attacks and the subsequent war on terror. In this sense, Osama bin Laden’s strategy of provoking Western democracies into undermining their own values can be seen as perversely successful.

The legacy of decolonization and the rise of populism

The end of the Cold War and the 9/11 attacks also transformed Europe’s understanding of its past. While World War II is still invoked as a defining event, its place in the historical imagination has been displaced by the legacy of decolonization. This shift has led to a focus on immigration, race, and culture as central political concerns.

The rise of populism and far-right politics in America and Europe can be understood as a reaction to these changes. These movements often hark back to historical doctrines such as the Monroe Doctrine in America or the myth of a culturally homogeneous Christian continent in Europe. Their animating force is a hostility toward immigrants, particularly Muslims.

This political vision has its roots in the process of decolonization, which transformed immigration into a defining political reality. The end of the Cold War and the 9/11 attacks have accelerated these trends, leading to a political landscape dominated by fears of what might be called ‘reverse colonization.’

The legacy of 9/11 is complex and multifaceted, touching on issues of security, politics, and societal values. As we reflect on the 25th anniversary of these attacks, it’s clear that their impact will continue to shape the world for years to come.

Author

Sophie Donovan

Sophie Donovan, Manchester-born and classically elegant, once turned down a commission to chase a long-form piece on Salford’s textile heritage, filing instead from the mill where her grandmother worked. Advocates patient, context-rich features and brings a taste for quiet narrative detail and theatre aficionadoship.