ソビエト連邦が崩壊した要因は何？
Following the Allies' victory over Germany and Japan in 1945, the Soviet Union became the sole superpower rival to the United States. The Cold War between the two nations led to military buildups, the nuclear arms race, and the Space Race. By the early 1980s the Soviet armed forces had more troops, tanks, artillery guns and nuclear weapons than any other nation on earth. The Soviet Union fell in 1991, not because of military defeat but because of economic and political factors - see History of the Soviet Union (1982–91).
economic and political factors