The U.S. Department of Homeland Security (DHS) was established in 2002 to ensure the nation's security. Its main job is to manage border security, immigration control, and disaster response. It coordinates with other local, state, and international bodies to tackle various threats effectively. Inside the DHS, there are several smaller agencies like the U.S. Customs and Border Protection (CBP) and the Federal Emergency Management Agency (FEMA) that help carry out its mission. By working together, they aim to keep the U.S. and its citizens safe and secure.