The Breakdown of the Grand Alliance 1945-47 By em2019 Period: 1945 to 1945 Potsdam Conference 1946 Social Unity Party formed Period: 1946 to 1946 Paris Conference of Foreign Ministers Mar 5, 1946 General Clay halted reparation payments from Soviet zone May 3, 1946 Churchill's Iron Curtain speech Jan 1, 1947 Anglo-American Bizone formed 1947 Communists excluded from government in France and Italy Period: 1947 to 1947 Council of Foreign Ministers' Meeting, Moscow May 6, 1947 Marshall Aid Plan announced May 10, 1947 Cominform founded Oct 2, 1947 Peace treaties signed with Italy, Romania, Bulgaria, Finland and Hungary Dec 3, 1947 Truman Doctrine announced