What happened in the United States on September 11, 2001?

On September 11, 2001, a significant and tragic event occurred when terrorists carried out coordinated attacks against the United States. Four commercial airplanes were hijacked by members of the extremist group al-Qaeda, leading to the destruction of the World Trade Center in New York City and damage to the Pentagon near Washington, D.C. This day is known as 9/11 and marked a pivotal moment in U.S. history, leading to extensive changes in domestic and foreign policy, particularly concerning national security and counter-terrorism efforts.

The other options do not relate to this date. A major earthquake did not occur on September 11, 2001. Additionally, Election Day does not fall on this date; it occurs on the first Tuesday after the first Monday in November. While the stock market did experience significant impacts following the events of that day, it did not crash specifically on September 11, 2001. Instead, the attacks themselves had a profound effect on the economy in the days that followed.