Post-9/11 refers to the period following the September 11, 2001 terrorist attacks in the United States, which dramatically altered national security policies and international relations. This era is characterized by heightened security measures, military interventions, and a redefined approach to terrorism that emphasized preemptive action and global cooperation. The events of 9/11 shifted public perception and policy, leading to significant developments in various areas including foreign policy, civil liberties, and domestic security.
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