U.S. Military Presence in East Asia (20th Century) By nataliechenes Period: 1898 to 1946 U.S. Colonization of Philippines Period: 1939 to 1945 World War II Period: 1945 to 1952 Military Occupation of Japan by Allied Powers Period: 1945 to 1948 U.S. Military Gov't Rule in South Korea Period: 1950 to 1953 Korean War Period: 1955 to 1975 Vietnam War