Ralph Bunche becomes first African American to win the Nobel Peace Prize, awarded for his role in negotiating Middle East armistice.President Truman accepts National Security Council Paper 68.
President Truman authorizes building a hydrogen bomb.
McCarran Internal Security Act.
Julius and Ethel Rosenberg arrested as atomic spies.
Joseph McCarthy launches first of many accusations against alleged communists.
French-controlled Vietnam receives U.S. financial aid and military advisers.
Congress changes Puerto Rico's political status from protectorate to commonwealth.Alger Hiss is convicted of perjury.North Korea invades South Korea, igniting the Korean War.
President Truman orders U.S. Air Force, Navy, and Army to assist South Korea.
U.S. forces cross the thirty-eighth parallel in Korea, leading to Chinese intervention on North Korean side (October 9).