Decline Of The Cold War By Dylan Pearson Dec 15, 1969 Detente Dec 15, 1979 Perestrokika Reforming economic system Dec 15, 1980 Polish Solidarity Movement peaceful soviet movenment Dec 15, 1983 Strategic Defense Initiative sophisticated anti ballistic missile system Dec 15, 1985 Glasnost Dec 15, 1990 Germany Reunited east and west Germany were reunited Dec 15, 1999 Boris Yeltsin Russian politician