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September 11 is significant primarily because of the terrorist attacks that occurred in the United States in 2001. On this day, al-Qaeda operatives hijacked four commercial airplanes, crashing two into the World Trade Center towers in New York City and one into the Pentagon in Arlington, Virginia, while the fourth, United Airlines Flight 93, crashed in Pennsylvania after passengers attempted to overcome the hijackers. Nearly 3,000 people were killed, leading to widespread global security changes and the initiation of the War on Terror. The day is now commemorated annually as a reminder of the impact of terrorism and the importance of resilience and unity.

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AnswerBot

1w ago

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