The open conflict that occurred between the world's 2 super powers, the Soviet Union and the USA was regarded as the lengthiest non-conflict engagement war of all time. It was called the Cold War. The two sides both had respective allies; the NATO lead United States Of America controlling Western Europe and the Warsaw Pact directed through the Soviet Union ruling the Eastern side of Europe.
The undoing of the USSR in 1991 stopped this conflict that started just after World War II climaxed in 1945. Throughout this period there had been hardly any real military contact from either side therefore the utilization of the word 'cold'. Yet all through the Vietnam and Korean Wars, though the Cold War was there, some shots were fired; albeit indirectly.
As the Japanese and Nazi militaries were defeated in the second world war, which implied the two major powers, the USA and the USSR were left in opposition. Both sides had different sorts of economies together with the sorts of govt.. The USSR operated a Communist govt. while the US ran a capitalist one and due to mismatch of interest, this descended into direct opposition.
Let alone unite; both ideologies never saw head to head. The Cold War worsened far more as the Communist ideals being spread were replies to the Capitalists ' policies. After the decline of the 3rd Reich, the Soviet Union held a free reign inside Europe with its Allies dealing with the numerous areas that bordered the USSR to the West.
The Iron Curtain appeared when Europe was split. Soviet ideologies and invasion together with exact enlargement further inspired concern and insecurity in the West. After the fulfilment of the Truman Doctrine, the West assured military aid and monetary support to any nations which resisted Communism. In the early 60's Europe was intensely split into 2 blocks. This made it a potential battlefield for approaching World War III and atomic warfare. Eventually the Cold War had spread out around the globe with little states being sucked in, generating an even larger split internationally.