The significance of the September 11 attacks in the context of U.S. foreign policy was profound, leading to a significant shift towards a focus on counter-terrorism. The attacks prompted the U.S. to initiate the War on Terror, including military interventions in Afghanistan and Iraq. This shift influenced U.S. relations worldwide, leading to increased security measures and a reevaluation of foreign policy objectives. Additionally, the attacks fostered a climate of heightened security at home and abroad, impacting civil liberties and international diplomacy.