<P> By the 1970s , both sides had become interested in making accommodations in order to create a more stable and predictable international system , inaugurating a period of détente that saw Strategic Arms Limitation Talks and the US opening relations with the People 's Republic of China as a strategic counterweight to the Soviet Union . Détente collapsed at the end of the decade with the beginning of the Soviet -- Afghan War in 1979 . The early 1980s were another period of elevated tension , with the Soviet downing of Korean Air Lines Flight 007 ( 1983 ) , and the `` Able Archer '' NATO military exercises ( 1983 ) . The United States increased diplomatic , military , and economic pressures on the Soviet Union , at a time when the communist state was already suffering from economic stagnation . In the mid-1980s , the new Soviet leader Mikhail Gorbachev introduced the liberalizing reforms of perestroika ( `` reorganization '' , 1987 ) and glasnost ( `` openness '' , c. 1985 ) and ended Soviet involvement in Afghanistan . Pressures for national independence grew stronger in Eastern Europe , especially Poland . Gorbachev meanwhile refused to use Soviet troops to bolster the faltering Warsaw Pact regimes as had occurred in the past . The result in 1989 was a wave of revolutions that peacefully ( with the exception of the Romanian Revolution ) overthrew all of the communist regimes of Central and Eastern Europe . The Communist Party of the Soviet Union itself lost control and was banned following an abortive coup attempt in August 1991 . This in turn led to the formal dissolution of the USSR in December 1991 and the collapse of communist regimes in other countries such as Mongolia , Cambodia and South Yemen . The United States remained as the world 's only superpower . </P>
<P> By the 1970s , both sides had become interested in making accommodations in order to create a more stable and predictable international system , inaugurating a period of détente that saw Strategic Arms Limitation Talks and the US opening relations with the People 's Republic of China as a strategic counterweight to the Soviet Union . Détente collapsed at the end of the decade with the beginning of the Soviet -- Afghan War in 1979 . The early 1980s were another period of elevated tension , with the Soviet downing of Korean Air Lines Flight 007 ( 1983 ) , and the `` Able Archer '' NATO military exercises ( 1983 ) . The United States increased diplomatic , military , and economic pressures on the Soviet Union , at a time when the communist state was already suffering from economic stagnation . In the mid-1980s , the new Soviet leader Mikhail Gorbachev introduced the liberalizing reforms of perestroika ( `` reorganization '' , 1987 ) and glasnost ( `` openness '' , c. 1985 ) and ended Soviet involvement in Afghanistan . Pressures for national independence grew stronger in Eastern Europe , especially Poland . Gorbachev meanwhile refused to use Soviet troops to bolster the faltering Warsaw Pact regimes as had occurred in the past . The result in 1989 was a wave of revolutions that peacefully ( with the exception of the Romanian Revolution ) overthrew all of the communist regimes of Central and Eastern Europe . The Communist Party of the Soviet Union itself lost control and was banned following an abortive coup attempt in August 1991 . This in turn led to the formal dissolution of the USSR in December 1991 and the collapse of communist regimes in other countries such as Mongolia , Cambodia and South Yemen . The United States remained as the world 's only superpower . </P>
which event symbolizes the end of the cold war
which event symbolizes the end of the cold war
the formal dissolution of the USSR
the formal dissolution of the USSR