USA PATRIOT Act: A law passed shortly after 9/11 that expanded surveillance powers for law enforcement agencies to gather intelligence on potential terrorists.
Department of Homeland Security (DHS): Created in response to 9/11, this federal agency is responsible for coordinating efforts against domestic terrorism and ensuring homeland security.
Guantanamo Bay detention camp: A controversial prison facility established by the U.S. government post-2001 for detaining suspected terrorists captured during military operations.