A historical overview of the September 11 attacks, their timeline, global impact, and lasting legacy.
On September 11, 2001, coordinated terrorist attacks were carried out in the United States by the extremist group al-Qaeda.
Four commercial airplanes were hijacked:
Nearly 3,000 people were killed, making it one of the deadliest terrorist attacks in modern history.
American Airlines Flight 11 crashes into the North Tower of the World Trade Center.
United Airlines Flight 175 crashes into the South Tower, confirming the attacks were intentional.
American Airlines Flight 77 crashes into the Pentagon.
The South Tower collapses after burning for 56 minutes.
United Airlines Flight 93 crashes in Pennsylvania after passengers attempt to regain control.
The North Tower collapses.
| Category | Impact |
|---|---|
| Fatalities | Nearly 3,000 people |
| Emergency Responders | Hundreds of firefighters and police officers lost |
| Economic Damage | Billions of dollars in destruction and disruption |
Airport screening, intelligence sharing, and surveillance policies changed significantly worldwide.
The attacks continue to shape international relations, counterterrorism policy, and public memory.
Each year, ceremonies honor the victims, survivors, and first responders.
September 11 remains one of the most significant geopolitical turning points of the 21st century.