Detente: Detente refers to a period of improved relations and decreased tensions between rival countries. It was pursued by President Nixon in the early 1970s with attempts at dialogue with the Soviet Union.
Strategic Defense Initiative (SDI): The Strategic Defense Initiative was a proposed missile defense system by President Reagan which aimed to protect against potential nuclear attacks using space-based interceptors.
Perestroika: Perestroika was an economic reform policy introduced by Soviet leader Mikhail Gorbachev in the 1980s. It involved restructuring of economic planning and introducing elements of market economy within the socialist system.