Cold War Timeline By Edithxxcy_2004 Jan 1, 1945 Allies divided Germany into 4 zones. Period: May 3, 1945 to May 3, 2000 Edith's timeline Allies divided Germany into 4 zones. Feb 9, 1946 Stalin hostile speech - communism & capitalism were incompatible Jan 1, 1952 Puerto Rico becomes a commonwealth. Jan 1, 1952 A-bombs developed by Britain. May 1, 1955 Warsaw Pact formed. Jun 29, 1956 USSR sent tanks into Poznan, Poland, to suppress demonstrations by workers Aug 26, 1957 Vostok rocket launched 1st ICBM Jan 1, 1959 Fidel Castro takes power in Cuba. Jan 1, 1960 A-bombs developed by France. Jan 1, 1963 JFK is assasinated. Jul 1, 1963 Nuclear Test Ban Treaty ratified Jan 1, 1967 The US Secretary of Defence Robert McNamara admits that the US bombing raids had failed to meet their objectives. Apr 1, 1970 President Nixon extends Vietnam War to Cambodia Jan 1, 1973 V.S troops leave the Vietnam. Jan 1, 1985 Mikhail Gorbachov becomes the Soviet Union. Oct 1, 1986 President Reagan and Gorbachev resolve to remove all intermediate nuclear missiles from Europe Jan 1, 1991 The Soviet Union falls. Aug 1, 1991 End of Soviet Union and the Cold War Ends. Jan 1, 1993 Russia has a new constitution. Jan 1, 1998 Venezuela elects Hugo Chavez as President.