Which major event took place on September 11, 2001?

The event that took place on September 11, 2001, which is accurately identified, was a series of coordinated terrorist attacks carried out by al-Qaeda against the United States. On that day, four commercial airplanes were hijacked, with two crashing into the Twin Towers of the World Trade Center in New York City, one crashing into the Pentagon in Arlington, Virginia, and the fourth, United Airlines Flight 93, crashing into a field in Pennsylvania after passengers attempted to regain control from the hijackers.

This event had a profound impact on the United States and the world, leading to significant changes in domestic and foreign policy, heightened security measures, and the initiation of the War on Terror, including military operations in Afghanistan. The ramifications of these attacks continue to influence global politics and security protocols.

The other events listed, such as the election of Barack Obama in 2008, the signing of the Kyoto Protocol in 1997, and the launch of the Space Shuttle Endeavour in various missions, do not relate to the significant terrorist attacks that occurred on September 11, 2001, marking it as a unique and historically significant day.