Germany was divided into four zones after World War II. Each zone was governed by one of the four major powers at the time, including the United States, Great Britain, Soviet Union and France.
A similar type of occupational division was slated for the German capital of Berlin at the Potsdam conference in July 1945. However, the city of Berlin was completely inside the Soviet occupied area of Germany, and the Soviets used this leverage to their advantage when possible. This caused a great deal of added tension to the already escalating Cold War between the United States and the Soviet Union. East Germany, which was controlled by the Soviet Union, was significantly different than its counterpart of West Germany, and attempted defections from the eastern side were common. Germany was reunited in October 1990.