Cause of Cold War By Jiayitan Feb 4, 1945 Yalta conference Apr 12, 1945 Roosevelt dies Jul 16, 1945 First Atomic Bomb Jul 17, 1945 Potsdam conference Aug 10, 1945 Divided Korea in 38th parallel Feb 22, 1946 Long Telegramme Mar 5, 1946 Iron Curtain Period: Feb 6, 1947 to Feb 6, 1991 Cold War period Mar 12, 1947 Truman Doctraine Jun 5, 1947 Marshall Plan Jun 24, 1948 Berlin Blockade Apr 4, 1949 NATO formed May 14, 1949 Warsaw Pact Feb 14, 1950 Sino Soviet treaty Mar 5, 1953 Stalin dies Mar 9, 1955 West Germany in NATO