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The 9/11 Terrorist Attacks: A Day That Changed the World Forever On the morning of September 11, 2001 , the world watched in horror as one of the most devastating terrorist attacks unfolded in the United States. The 9/11 terrorist attacks not only claimed thousands of innocent lives but also left a permanent mark on global politics, security, and the collective consciousness of humanity. This tragic event involved four coordinated hijackings by 19 terrorists affiliated with