east and west side of berlin wall

Berlin Wall, German Berliner Mauer, barrier that surrounded West Berlin and prevented access to it from East Berlin and adjacent areas of East Germany during the period from 1961 to 1989. In the years between 1949 and 1961, about 2.5 million East Germans had fled from East to West Germany, including steadily rising numbers of skilled workers, professionals, and intellectuals. Their loss threatened to destroy the economic viability of the East German state. In response, East Germany built a barrier to close off East Germans’ access to West Berlin and hence West Germany.