The US response to the terrorist attacks of September 11, 2001, included launching the War on Terror, which led to the invasion of Afghanistan to dismantle al-Qaeda, the terrorist organization responsible for the attacks. The US also passed the USA PATRIOT Act, which expanded government surveillance powers and enhanced law enforcement capabilities to fight terrorism. Additionally, the US significantly increased security measures, tightened immigration policies, and formed the Department of Homeland Security to prevent future attacks.
