Before 1990 , there were radical political changes in the Eastern Bloc that had to do with the liberalization of the Eastern Bloc 's authoritarian systems and the erosion of political power in the pro-Soviet governments in nearby Poland and Hungary .
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 .
Berlin Wall