<P> In 1989 a series of revolutions in nearby Eastern Bloc countries--Poland and Hungary in particular--caused a chain reaction in East Germany that ultimately resulted in the demise of the Wall . After several weeks of civil unrest, the East German government announced on 9 November 1989 that all GDR citizens could visit West Germany and West Berlin . Crowds of East Germans crossed and climbed onto the Wall, joined by West Germans on the other side in a celebratory atmosphere . Over the next few weeks, euphoric people and souvenir hunters chipped away parts of the Wall; the governments later used industrial equipment to remove most of what was left . </P> <P> A fact standing out from the events leading up to the night of November 9, 1989 is that this is an historical example of a dictatorial regime being overcome by a "peaceful civil resistance movement". </P> <P> Contrary to popular belief, the Wall's actual demolition did not begin officially until the summer of 1990 and continued until 1992 . The "fall of the Berlin Wall" paved the way for German reunification, which formally took place on 3 October 1990 . </P> <P> After the end of World War II in Europe, what remained of pre-war Germany west of the Oder - Neisse line was divided into four occupation zones (as per the Potsdam Agreement), each one controlled by one of the four occupying Allied powers: the United States, the United Kingdom, France and the Soviet Union . The capital of Berlin, as the seat of the Allied Control Council, was similarly subdivided into four sectors despite the city's location, which was fully within the Soviet zone . </P>

When did they tear down the berlin wall
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