 Complete the following phrase:  In 1989, a series of revolutions in nearby Eastern Bloc countriesin Poland and Hungary in particularcaused a chain reaction in East Germany. In particular, the Pan-European Picnic in August 1989 set in motion a peaceful development during which the Iron Curtain largely broke, the rulers in the East came under pressure, the Berlin Wall fell and finally the Eastern Bloc fell apart. After several weeks of civil unrest, the East German government 