Each of the three heads of state and government had their own agenda for post-war Germany and liberated Europe. Roosevelt wanted Soviet support in the American Pacific War against Japan, particularly for the planned invasion of Japan (Operation August Storm) and Soviet participation in the United Nations; Churchill insisted on free elections and democratic governments in Central and Eastern Europe (particularly Poland); Stalin called for a Soviet sphere of political influence in Central and Eastern Europe as an essential aspect of the USSR`s national security strategy. Stalin`s position at the conference was one he believed to be so strong that he could dictate conditions. According to the member of the American delegation and future Secretary of State, James F. Byrnes, ”the question was not what we would leave to the Russians, but what we could do to the Russians”  Four months after Roosevelt`s death on August 6, 1945, President Truman ordered the dropping of a nuclear bomb on Hiroshima. The Potsdam conference was held from July to August 1945, which was also attended by Clement Attlee (who had replaced Churchill as Prime Minister) and President Harry S Truman (who represented the United States after Roosevelt`s death).  In Potsdam, the Soviets disputed allegations that they had interfered in the affairs of Romania, Bulgaria and Hungary.  The conference led to (1) Potsdam`s declaration on Japan`s surrender and (2) the Potsdam Agreement on the Soviet annexation of the former Polish territory to the curzon Line and provisions that will be addressed in a possible final treaty to end the Second World War on the annexation of parts of Germany east of the Oder-Neisse line to Poland. and North-East Prussia to the Soviet Union. The Potsdam Conference (July 17 to August 2, 1945) was the last meeting of the ”Great Three” heads of state during the Second World War.
With U.S. President Harry S. Truman, British Prime Minister Winston Churchill (and his successor Clement Attlee) and … Yalta was the second of three major war conferences among the Big Three. It was preceded by the Tehran Conference in November 1943, followed by the Potsdam Conference in July 1945, preceded by a conference in Moscow in October 1944, in which President Roosevelt did not participate, during which Churchill and Stalin had spoken about European Western and Soviet spheres of influence.  In February 1945, the Three Greats – Churchill, Roosevelt and Stalin – met in Yalta, in the region of the USSR in Crimea. The Yalta Conference, held from 4 to 11 February 1945, was the meeting of the heads of government of the United States, the United Kingdom and the Soviet Union during World War II to discuss the reorganization of Europe after the war. On March 1, Roosevelt assured Congress: ”I come from Crimea with the firm conviction that we have begun on the road to a world of peace.”  However, the Western powers soon realized that Stalin would not keep his promise of free elections for Poland.