Cold War By bradenalan May 20, 1945 world war II ends in Europe Aug 20, 1945 U.S drops atomic bomb on Japan Jan 20, 1946 first East European communist set up Oct 20, 1949 communist win chinese civil war. Jun 20, 1950 u.s members fight korean war Jul 27, 1953 U.s and korean war ends Apr 20, 1961 bay of pigs invasion on cuba Oct 20, 1962 cuban missle crises Oct 20, 1964 china explodes its first atomic bomb Apr 20, 1975 south vietnam fails to communist forces.