Premise: The Berlin Wall ( Berliner Mauer ) was a guarded concrete barrier that physically and ideologically divided Berlin from 1961 to 1989 . Constructed by the German Democratic Republic ( GDR , East Germany ) , starting on 13 August 1961 , the Wall completely cut off ( by land ) West Berlin from surrounding East Germany and from East Berlin until government officials opened it in November 1989 . The Eastern Bloc claimed that the Wall was erected to protect its population from fascist elements conspiring to prevent the `` will of the people '' in building a socialist state in East Germany .
Hypothesis: The Berlin Wall was a wall.
Label: ENTAILMENT