Fall of Communist Regimes in East European Countries: Gorbachev had withdrawn the Soviet forces from the East European countries. He also took the decision to end the Warsaw Pact. This culminated in lessening the hold of the Soviet Union over the East European countries $($Poland$,$ Hungary, Romania, etc$).$ In all these countries a wind of change was blowing. Earlier in $1989$ the Berlin Wall $($constructed in $1961$ to prevent people getting into or out of East Germany$)$ was pulled down. Finally, the Communist governments in East Europe fell. This hastened the break$-$up of the Soviet Union