Answer:
Why did they do ?
Step-by-step explanation:
Mikhail Gorbachev, in full Mikhail Sergeyevich Gorbachev, (born March 2, 1931, Privolnoye, Stavropol kray, Russia, U.S.S.R.), Soviet official, general secretary of the Communist Party of the Soviet Union (CPSU) from 1985 to 1991 and president of the Soviet Union in 1990–91. His efforts to democratize his country’s political system and decentralize its economy led to the downfall of communism and the breakup of the Soviet Union in 1991. In part because he ended the Soviet Union’s postwar domination of eastern Europe, Gorbachev was awarded the Nobel Prize for Peace in 1990.