Final answer:
The National Security Act of 1947 reorganized the military and created the CIA. It streamlined the government's security by establishing the National Security Council and tasked the CIA with collecting and analyzing intelligence in foreign nations.
Step-by-step explanation:
The National Security Act of 1947 was passed and reorganized the military and created the Central Intelligence Agency (CIA). Under this act, the U.S. military was streamlined and the Department of the Air Force was established, which later became part of the Department of Defense in 1949 along with the Departments of the Army and Navy. The act also created the National Security Council to advise the president on security issues and oversee the CIA. The CIA was responsible for collecting and analyzing intelligence gathered by agents in foreign countries and eventually played a growing role in the Cold War.