Even before the United States entered WWII, Franklin Roosevelt met with the Winston Churchill to produce the Atlantic Charter, establishing war aims for the Allies. Roosevelt, Churchill and the leaders of many different Allied nations met at least 20 different times throughout the war to discuss priorities and strategy. Then, as the war drew to a close in 1945, the two most significant conferences took place. At the Yalta Conference, Roosevelt, Churchill and Josef Stalin met to plan the future of Europe. Specifically, they divided Germany into four occupation zones and haggled over the Soviet Union's acceptable sphere of influence, including the annexation of half of Poland. At the Potsdam Conference, they made plans to remake Germany, and issued an ultimatum to Japan. But it was clear from the tone of negotiations that, with the war behind them, the Allies had come to an end.