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Cold War – period of political and military tension that occurred after World War II between powers in the Western Bloc (the United States, its NATO allies and others) and powers in the Eastern Bloc (the Soviet Union and its allies in the Warsaw Pact). Historians have not fully agreed on the dates, but 1947–1991 is common. It was termed as "cold" because there was no large-scale fighting directly between the two sides. Based on the principle of mutually assured destruction, both sides developed nuclear weapons to deter the other side from attacking. So they competed against each other via espionage, propaganda, and by supporting major regional wars, known as proxy wars.

When East Germany and West Germany devided in support for Soviet Union and NATO respectively the tensions among two superpowers rose to new heights. Bringing both Soviet and USA in confrontation directly face to face with each other.
Both can't attack each other because they had both Nuclear Power's at hand so they financed, Supported in various ways to help their influenced Nation's on their conflicts all over Europe & Asia.
Ensuring the new Rivalry and Power Lust to do the inevitable.....WAR