The main objective of the Potsdam conference was to put an end to the post-war period and to put into practice all that had been agreed in Yalta. While the Yalta meeting was rather friendly, the Potsdam conference was marked by differences of opinion that were the result of some important changes since the Yalta conference. In addition to the Potsdam Agreement, July 26, Churchill; Truman; And Chiang Kai-shek, president of the Chinese nationalist government (the Soviet Union was not at war with Japan), issued the Potsdam Declaration, which described the conditions of surrender for Japan during World War II in Asia. In July 1945, Allied leaders met in Potsdam, confirming previous agreements on post-war Germany and reiterating the call for the unconditional surrender of all Japanese armed forces, explicitly stating that “the alternative for Japan is rapid and total destruction.” The Yalta conference granted France an area of occupation within Germany. France participated in the Berlin Declaration and is expected to be a member of the Allied Control Council on an equal footing. However, at the request of the Americans, Charles de Gaulle was not invited to Potsdam, as he had been denied representation in Yalta. The little diplomatic thing was for him a cause of deep and persistent resentment.  The reasons for this omission were the long-standing personal antagonism between Roosevelt and de Gaulle, the continuing quarrels over the French and American zones of occupation, and the expected conflicts of interest over French Indochina.  It also reflected the British and American judgment that the French objectives on many of the conference agenda were probably at odds with the agreed Anglo-American objectives.
 Leaders have stated that they are prepared to support any application for membership by states that remained neutral during the war and met other requirements. The three major felt it was necessary to make it clear that they were reluctant to support the spanish government`s request, which was set up with the support of the axis powers.  At the conference, Allied leaders reaffirmed their previous commitment to the revocation of the German population of Poland, Czechoslovakia and Hungary; governments in these countries had already implemented. Potsdam`s three allies were convinced that the transfer of this German population should be completed as soon as possible. They stressed that transfers should be carried out in an orderly and humane manner. In the long run up to two million German civilians were killed in forced displacement. [Citation required] Already at the Potsdam Conference on 30 July 1945, the Allied Control Council was formed in Berlin to carry out the Allied resolutions (the “Four Ds”:   The Polish border became the Oder and the Neisse to the west, and the country received part of the former East Prussian. 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. At the conference, Truman called Stalin a “powerful new weapon” unspecified. Towards the end of the conference, on 26 July, potsdam`s declaration issued an ultimatum to Japan to surrender unconditionally or to face the “rapid and total destruction” that the new bomb did not mention, but promised that “it was not the intention to enslave Japan.”