Britannica Sources used in this answer

Why did the United States establish the Central Intelligence Agency after World War II?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

George W. Bush and Porter J. Goss at CIA headquarters in Langley, Virginia. — intelligence U.S. Pres. George W. Bush (front) and Porter J. Goss, director (2004–06) of the Central Intelligence Agency (CIA), heading to a press conference at CIA headquarters in Langley, Virginia, March 3, 2005.

The United States established the Central Intelligence Agency (CIA) in 1947 primarily to address the systemic failures in intelligence gathering that had plagued the country during and before World War II.12

Prior to the agency's creation, U.S. intelligence efforts were fragmented among the Office of Naval Intelligence, Army intelligence, and the FBI. These organizations frequently competed rather than cooperated, leading to a lack of coordination and the withholding of critical information from senior policymakers—a deficiency famously highlighted by the failure to adequately share intelligence regarding Japan before the attack on Pearl Harbor.12

Following the wartime success of the Office of Strategic Services (OSS), which had centralized intelligence analysis, President Harry S. Truman sought to maintain a coordinated postwar intelligence establishment. The National Security Act of 1947 formally established the CIA to serve as the preeminent agency responsible for correlating, evaluating, and disseminating intelligence to the National Security Council, thereby ensuring a more unified and efficient approach to national security.13