What major event took place on September 11, 2001, in the United States?

On September 11, 2001, a coordinated series of terrorist attacks were carried out by the extremist group al-Qaeda against the United States, primarily targeting the Twin Towers of the World Trade Center in New York City. This tragic event resulted in the destruction of the Twin Towers and significant loss of life, making it one of the deadliest terrorist attacks in U.S. history. The impact of 9/11 was profound, leading to substantial changes in U.S. domestic and foreign policy, including heightened national security measures and the initiation of the War on Terror. The attacks fundamentally altered the way Americans viewed security, global politics, and their own safety.

Other events listed, such as the assassination of a president, the end of the Cold War, or the launch of a space shuttle, did not occur on this date and do not relate directly to the significant historical context and ramifications of September 11, 2001.