The September 11 attacks in 2001 had a profound global impact, reshaping international relations, security policies, and perceptions of terrorism. The attacks prompted the United States to launch the War on Terror, leading to military interventions in Afghanistan and Iraq. These events triggered widespread changes in domestic security measures, including the establishment of the Department of Homeland Security in the U.S. and increased surveillance worldwide. Additionally, the attacks fueled a rise in anti-Muslim sentiment and contributed to ongoing conflicts in the Middle East, altering global geopolitical dynamics.