Early Cold War By timtohyAhlemeyer Period: Feb 4, 1945 to Feb 11, 1945 Yalta Conference Aug 6, 1945 United States first used atomic bomb in war Aug 8, 1945 Russia enters war against Japan Aug 14, 1945 Japaneses surrenders, ending World War 11 1946 Winston Churchill delivers "iron Curtain" speech 1947 Truman announces Truman Doctrine 1947 Marshall Plan is announced 1948 Communist takeover in Czechoslovakia Jun 24, 1948 Berlin Blockade begins 1949 NATO treaty rarified Apr 12, 1949 Berlin Blockade ends