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September 11th Attacks
Description: Al-Qaeda hijacked four commercial planes. Two crashed into the Twin Towers, one crashed into the Pentagon, and one crashed into a field in Pennsylvania.
Significance: Greatly impacted American lives, foreign policy, and domestic security. Many Americans died and many face the aftermath of the attacks through cancer PTSD.
Citation: Bergen, Peter L. "September 11 attacks". Encyclopedia Britannica, 3 May. 2025, https://www.britannica.com/September11attacks. Accessed 9 May 2025.