WORLD HISTORY

Detailed explanation-1: -Even though Berlin was located entirely within the Soviet part of the country (it sat about 100 miles from the border between the eastern and western occupation zones), the Yalta and Potsdam agreements split the city into similar sectors. The Soviets took the eastern half, while the other Allies took the western.

Detailed explanation-2: -The Soviet Union occupied East Germany and installed a rigidly controlled communist state. The other three Allies shared the occupation of West Germany and helped rebuild the country as a capitalist democracy. The City of Berlin, located 200 miles inside East Germany, was also divided.

Detailed explanation-3: -The barrier was built inside East Berlin on East German territory to ensure that it did not encroach on West Berlin at any point.

Detailed explanation-4: -The Soviet Union occupied most of eastern Germany, while the other Allied nations occupied western Germany. The German capital of Berlin was similarly divided into four zones of occupation.

Detailed explanation-5: -When the war in Europe ended in May 1945, however, Soviet troops were in complete control of eastern Germany and all of Berlin.