Berlin is the capital of united Germany. During the Cold War Berlin was divided into Totalitarian Communist, East Berlin and capitalist democratic West Berlin by the Berlin Wall. Now Berlin and Germany are united. It is quite a beautiful city.
East Berlin was the capital of East Germany and suffered the misery that the rest of East Germany suffered. West Berlin was theoretically independent but in practise very much like West Germany. "Mr. Gorbachev, tear down this wall!"- That old guy