Homeland Security Act of 2002

The Homeland Security Act of 2002 established the Department of Homeland Security (DHS) as a new cabinet-level agency to centralize the nation’s defense against terrorism following the September 11 attacks. The law combined 22 different federal agencies—including the Customs Service, the Coast Guard, and the Federal Emergency Management Agency (FEMA)—into a single department tasked with securing U.S. borders, protecting critical infrastructure, and coordinating emergency responses.

For everyday citizens, this act fundamentally changed how the government manages travel, immigration, and disaster relief. It led to the creation of the Transportation Security Administration (TSA) for airport screening, unified the various agencies that handle visas and border crossings, and established a national system for sharing threat information with state and local law enforcement. Additionally, the law provided new legal protections for companies developing anti-terrorism technologies and created a federal program to allow volunteer pilots to carry firearms to defend flight decks.