The Poles, but also the Czechs and Hungarians, had begun to drive out their German minorities and the Americans and The British were extremely concerned that a massive influx of Germans into their respective areas would destabilize them. Poland, Czechoslovakia and Hungary have called for the deportations to be temporarily suspended and carried out “in an orderly and humane manner” upon their resumption. The border of Poland became the Oder and the Neisse to the west, and the country received part of the former East Prussia. This required that millions of Germans be transferred to Germany in these regions. The Romanian, Hungarian and Bulgarian governments were already controlled by the Communists and Stalin stubbornly refused to let the Allies intervene in Eastern Europe. While in Potsdam, Truman Stalin spoke of the “new weapon” of the United States (the atomic bomb) that she wanted to use against Japan. On 26 July, the conference issued an ultimatum to Japan, which called for an unconditional surrender and, if not, threatened to launch more serious airstrikes. After Japan rejected this ultimatum, the United States dropped atomic bombs on Hiroshima and Nagasaki. When Truman informed Stalin of the atomic bomb, he stated that the United States had “a new weapon of unusual destructive force”, but that Stalin had full pity for the development of the atomic bomb from Soviet spy networks in the Manhattan Project and he told Truman at the conference that he hoped Truman would “use it well against the Japanese.”  Winston Churchill, who had served most of the war as British Prime Minister in a coalition government, was replaced during the conference by Clement Attlee. Since the early 1940s, Churchills had a Soviet policy that was very different from Roosevelt`s and regarded Stalin as an “evil tyrant” who led an abominable system.  General elections were held in the United Kingdom on 5 July 1945, but the results were delayed to allow the counting of votes of military personnel in their constituencies. The result was known at the conference, when Attlee became the new Prime Minister. Churchill himself was not at his best in Potsdam.
He was depressed, depressed and worried about the outcome of the home elections. He lacked the adrenaline rush that the nation`s war efforts had given him. He told his doctor: “I don`t want to do anything.