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The end of the cold war was necessitated to a great extent by President Richard Nixon of the USA, who opted to take a different approach of diplomacy on matters of international relations.He encouraged the USA to recognize China as a communist state and also adopted a relaxation policy towards the Soviet Union.
Another factor that contributed to the end of the cold war was the collapse of the Soviet Unions as a result of economic difficulties and the growing political tension in USSR. The final blow came when Mikhail Gorbachev took office in 1985 and implemented economic reforms that changed Russia's relations with the rest of the world.
The collapse of the Berlin Wall in November of the year 1989 marked the end of a long standing rivalry that had created tensions and rifts in the world.