What problems with U.S. intelligence gathering before the Pearl Harbor attack helped lead to the Central Intelligence Agency?

Prior to the attack on Pearl Harbor, the United States lacked a centralized civilian intelligence agency, relying instead on fragmented and uncoordinated efforts by the Office of Naval Intelligence, Army intelligence, and the FBI.1

These existing agencies were characterized by intense rivalries and a refusal to share sensitive information, often out of a desire to protect their own "security." Consequently, critical intelligence regarding Japanese activities was not shared between agencies or provided to senior policy makers, including President Franklin D. Roosevelt, in the months leading up to the December 1941 attack.1

This lack of coordination and the failure to synthesize intelligence were significant factors that highlighted the need for a unified organization. Following the war, these systemic weaknesses—along with the continued distrust between military and civilian intelligence services—led to the passage of the National Security Act in 1947, which established the Central Intelligence Agency to correlate and evaluate intelligence activities across the government.12