History- origins of cold war By wasabi-the-boss Feb 1, 1945 Yalta conference Period: Feb 1, 1945 to Dec 9, 1949 COLD WAR Jul 1, 1945 Potsdam Conference Feb 20, 1946 Kennan's long telegramme Mar 12, 1947 Truman doctrine announced Jun 5, 1947 Marshall plan announced Mar 13, 1948 Congress aprroves marshall aid Apr 4, 1949 NAATO formed