The Yalta Conference was held on February 4, 1945 to February 11, 1945. It was the heads of government of the Soviet Union, United States, and United Kingdom represented by Joseph Stalin, Franklin D. Roosevelt, and Winston Churchill. The goal was to make peace and self determination as they discussed the re-establishment. of the nations of war-torn Europe. 

There was three meetings referred to as the "Big Three." The one before the Yalta was "The Tehran Conference" which featured the three shown above again. After the Yalta Conference it was the Postdam Conference. The Postdam Conference featured Joseph Stallin, Winston Churchill, and Harry S. Truman. Midway through, Clement Attlee replaced Churchill. 

In the picture above, I added Clement Attlee and Harry S. Truman as more of a foreshadow for the Postdam Conference. The Swatsika in the back is to represent the time period.