Final answer:
Participants at the Potsdam Conference were Truman, Stalin, and Attlee, who discussed Europe's postwar reconstruction, including Germany's division. Truman's relationship with Stalin was strained over Soviet actions and demands for reparations.
Step-by-step explanation:
The Potsdam Conference was held in July and August of 1945 between leaders Harry S. Truman, Joseph Stalin, and Clement Attlee. The main purpose was to discuss postwar Europe's reconstruction, leading to a decision to divide Germany and Berlin into sectors controlled by the Americans, British, French, and Soviets. Changes in relationships were particularly influenced by Truman's disapproval of Soviet actions in Europe and his fears about Stalin's demands for high reparations from Germany. A significant historical backdrop to this conference was Truman learning about the successful test of the atomic bomb, which he later decided to use against Japan.