What happen in 2001 that happen to the US?

Answer 1

In 2001, the United States experienced the September 11 terrorist attacks, in which Al-Qaeda operatives hijacked four commercial airplanes. Two of the planes were flown into the Twin Towers of the World Trade Center in New York City, causing their collapse, while a third plane struck the Pentagon. A fourth plane, United Airlines Flight 93, crashed into a field in Pennsylvania after passengers attempted to overcome the hijackers. These attacks led to significant changes in U.S. domestic and foreign policy, including the initiation of the War on Terror and the invasion of Afghanistan.