The fall of the Soviet Union in 1991 resulted from economic weaknesses due to huge military spending and maintaining satellite states, political unaccountability under communist single-party rule, Gorbachev's reforms allowing more freedom and democracy that further destabilized communist control, and the rise of nationalism among republics like Russia, Baltic states, and Ukraine that no longer wanted to be part of the USSR. Mikhail Gorbachev as the last Soviet leader introduced reforms like perestroika and glasnost to revive the economy but they had the unintended effect of weakening central control and empowering independence movements among the republics.