The Department of Homeland Security combined 22 different federal departments and agencies into a unified, integrated cabinet agency when it was established in 2002.
A summary of historical laws and regulations constructing and modifying the existing Department of Homeland Security.
- DHS seal was created in 2003 to symbolize the Department's mission of preventing attacks and protecting Americans on land, sea and air.
- Chronology of Homeland Security Advisory System from implementation until replaced by National Terrorism Advisory System.
A list of the former Secretaries of the Department of Homeland Security.
DHS was created through the integration of all or part of 22 different federal departments and agencies into a unified Department.