On September 11, 2001, terrorists associated with the Islamic extremist group al-Qaeda hijacked four commercial airplanes in the United States. Two of the planes were flown into the Twin Towers of the World Trade Center in New York City, causing the buildings to collapse and killing nearly 2,000 people. A third plane was flown into the Pentagon in Arlington, Virginia, killing nearly 200 people. The fourth plane, United Airlines Flight 93, was headed for a target in Washington, D.C., but crashed in a field in Pennsylvania after passengers attempted to overcome the hijackers.

The attacks on September 11th had far-reaching consequences, including the launch of the War on Terror by the United States and its allies, the invasion of Afghanistan to overthrow the Taliban regime, which had harbored al-Qaeda terrorists, and the invasion of Iraq in 2003. The attacks also led to increased security measures, such as the creation of the Department of Homeland Security and the implementation of more stringent airport security procedures. The events of September 11th continue to shape U.S. foreign policy and global politics to this day.
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