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How 9/11 changed the world

Twenty-five years since 9/11

This Friday marks the 25th anniversary of the September 11 attacks on the United States. The attacks were among the most profound tragedies in American history, but their shockwaves extended far beyond US borders. To mark the anniversary, GZERO and our parent company, Eurasia Group, are examining ways September 11 changed the world – from security and foreign policy to trade, the media, and more.

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The enduring legacy of 9/11, with former Defense Secretary Mark Esper
GZERO World with Ian Bremmer Podcast

The enduring legacy of 9/11, with former Defense Secretary Mark Esper

Former Defense Secretary Mark Esper reflects on 25 years since 9/11, the lessons of America’s forever wars, and the biggest threats to US national security today


This week marks 25 years since 9/11—the deadliest terror attack the world has ever seen and a defining moment in American history. The attacks transformed US politics and national security. The war on terror became the organizing principle of American foreign policy. Former Secretary of Defense Mark Esper joins Ian Bremmer on the GZERO World Podcast to reflect on the day that forever changed how Americans thought about national security, and how the United States wielded its enormous power around the world.
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Terrorism fades as Americans’ top concern
Graphic Truth

Terrorism fades as Americans’ top concern

Fast forward 25 years from 9/11, and the top problems have shifted away from terrorism – less than 1% of respondents ranked it their top problem in August 2026.

How China, BRICS, and a new balance of power emerged from 9/11’s shadow
Analysis

How China, BRICS, and a new balance of power emerged from 9/11’s shadow

Some of the most consequential changes of the post-9/11 era began quietly, far from the battlefields of the war on terror.

The last time America watched together
Analysis

The last time America watched together

September 11 transformed what Americans watched, how journalists covered the world, and ultimately whom the public trusted to tell them about it.

America’s long arm of counterterrorism
Hard Numbers

America’s long arm of counterterrorism

In the 25 years since 9/11, the US has pursued counterterrorism operations in dozens of countries around the world.

The cascading consequences of 9/11 for America and the Middle East
Analysis

The cascading consequences of 9/11 for America and the Middle East

Osama bin Laden was killed and al-Qaeda dismantled, but the wars he provoked left the Middle East less stable and America’s standing in the region diminished.

Former top US official regrets Iraq becoming a ‘magnet’ for terrorism
News

Former top US official regrets Iraq becoming a ‘magnet’ for terrorism

If Michael Chertoff has one regret from his tenure in the Bush administration, it's Iraq.

GZERO WORLD:  Tragedy in a war of choice
News

The problem with "wars of choice"

Over time, if you launch a war of choice you're going to have problems, says Richard Engel, NBC's chief foreign correspondent.

The global geography of terrorism is shifting
Graphic Truth

The global geography of terrorism is shifting

Since 9/11, the most dramatic shift in the number of terrorist attacks has been toward sub-Saharan Africa.