Page "United States Department of Homeland Security" Paragraph 4

According to Peter Andreas, a border theorist, the creation of DHS constituted the most significant government reorganization since the Cold War, and the most substantial reorganization of federal agencies since the National Security Act of 1947, which placed the different military departments under a secretary of defense and created the National Security Council and Central Intelligence Agency.

DHS also constitutes the most diverse merger of federal functions and responsibilities, incorporating 22 government agencies into a single organization.