History of the Soviet Union (1985–1991)
By 1989, the Soviet government found it to be too difficult for the Soviet Union to keep its control over its Eastern European bloc and decided to let them choose their own futures. After the end of the Second World War, with the support of the Soviet Union, communist governments were ruling all these countries. The change in the policy of the Soviet Union resulted into fall of the communist governments in many such countries by 1990: in Bulgaria, Czechoslovakia, East Germany, Hungary, Poland and Romania.