start of the Cold War By Megan Flynn Feb 7, 1945 Yalta Conference May 7, 1945 Hitler defeated Period: May 7, 1945 to May 7, 1950 Start of the Cold War Jul 7, 1945 Postdam conference Mar 7, 1947 The Truman Doctrine is announced Sep 7, 1947 Stalin sets up Cominform Mar 7, 1948 Marshall Aid introduced May 7, 1948 USSR blockades Apr 7, 1949 NATO set up May 7, 1949 Berlin blockade lifted