National Security Act of 1947
Congress passed the National Security Act, creating the CIA, the National Security Council, and the Department of Defense. It was the first major reorganization of U.S. intelligence since World War II.
The CIA became the primary civilian intelligence agency, replacing the wartime Office of Strategic Services.
The 1947 structure lasted nearly 60 years until the 9/11 attacks prompted the creation of ODNI.
Shows how intelligence structures are created and later dismantled as political priorities shift.
