World 17 sources · over 2 days Latest coverage 11 Sept 2026, 5:31 am UTC

Twenty-Five Years After 9/11: How the Attacks Changed America and the World

As the 25th anniversary of the September 11 attacks is marked, Americans reflect on the tragedy's enduring impact on security, foreign policy, and collective memory.

By Jonas Weber · First published 11 Sept 2026

In brief

  1. The September 11, 2001 attacks killed nearly 3,000 people in New York, Washington, and Pennsylvania.
  2. The attacks led to sweeping changes in global security, surveillance, and US foreign and domestic policy.
  3. Commemorative ceremonies are being held across the United States to honor the victims and first responders.
  4. The anniversary prompts personal and national reflection on the legacy and ongoing effects of 9/11.
  5. The aftermath of 9/11 continues to influence American society, politics, and international relations.
Twenty-Five Years After 9/11: How the Attacks Changed America and the World
Source: ABC Top Stories

Timeline · 7 moments

7 moments Open the full timeline →

Coordinated terrorist attacks strike New York, Washington, and Pennsylvania

South China Morning Post ↗

Media mark upcoming 20th anniversary of 9/11 attacks

BBC - Home ↗

Outlets invite public to share memories ahead of 25th anniversary

The Independent ↗

Photos highlight changes in Lower Manhattan since 9/11

ABC Top Stories ↗

25th anniversary ceremonies planned across US

ABCNews.com ↗

New York marks 25th anniversary with commemorative ceremony

NDTV News - World-news News ↗

Reflections on the legacy and ongoing impact of 9/11

Top World News- News18.com ↗

How it started

On September 11, 2001, a coordinated terrorist attack was carried out in the United States. Nineteen hijackers took control of four commercial airplanes. Two planes were flown into the Twin Towers of the World Trade Center in New York City. Another hit the Pentagon in Virginia, while the fourth crashed in a field in Pennsylvania after passengers intervened. Nearly 3,000 people died in the attacks, which shocked the world and brought lasting change to US society and global security.

How it unfolded

The attacks began on the morning of September 11, 2001, with the first plane striking the North Tower of the World Trade Center at 8:46 a.m. Within minutes, a second plane hit the South Tower, and both buildings collapsed within hours. Another plane struck the Pentagon, and the fourth crashed in Pennsylvania. The immediate aftermath saw emergency responses in New York, Washington, and Pennsylvania, with first responders risking their lives to save others.

In the days and years following, the US launched the War on Terror, including military operations in Afghanistan and later Iraq. Security policies changed quickly, with new measures in airports and public spaces. The attacks also shaped public opinion, politics, and international relations.

As the 25th anniversary approaches in September 2026, ceremonies and tributes are planned across the country. Media outlets are sharing photographs, survivor stories, and reflections on the attacks' enduring impact. Public discourse also includes debates on how the events have shaped American identity and policy.

Where it stands

Commemorations for the 25th anniversary are taking place in New York, Virginia, and Pennsylvania. Survivors, families, and officials are gathering to remember those lost. The legacy of 9/11 remains visible in the rebuilt World Trade Center area and in ongoing discussions about security and civil liberties. The attacks continue to influence American society, with their impact felt in everything from foreign policy to cultural memory.

What to watch

This anniversary has sparked renewed conversations about how the US remembers and learns from 9/11. Ongoing debates focus on the balance between security and personal freedoms, as well as how future generations will understand the attacks' significance. Attention will also turn to how the country continues to support survivors and families affected by the tragedy.

Written from 17 outlets' coverage of this story. Every timeline entry links to the original report.

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