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After the Berlin blockade in 1949, western countries joined together as the [[North Atlantic Treaty Organization]] (NATO). In response, in 1955, the [[Soviet Union]] formed a communist alliance in the '''Warsaw Pact''', which included all the communist countries of Eastern Europe and the Soviet Union itself.

After the Berlin blockade in 1949, western countries joined together as the [[North Atlantic Treaty Organization]] (NATO). In response, in 1955, the [[Soviet Union]] formed a communist alliance in the '''Warsaw Pact''', which included most of the communist countries of Eastern Europe (not including Yugoslavia) and the Soviet Union itself.