(Bonus) Origins of the Cold War - Wikipedia

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(Bonus) The Cold War originated in the breakdown of relations between the two main victors in World War II: United States and the Soviet Union, and their respective allies, the Western Bloc and the Eastern Bloc, in the years 1945–1949. The origins derive from diplomatic (and occasional military) confrontations stretching back decades, followed by the issue of political boundaries in Central Europe and non-democratic control of the East by the Soviet Army. In the 1940s came economic issues (especially the Marshall Plan) and then the first major military confrontation, with a threat of a hot war, in the Berlin Blockade of 1948–1949. By 1949, the lines were sharply drawn and the Cold War was largely in place in Europe.[1] Outside Europe, the starting points vary, but the conflict centered on the US's development of an informal empire in Southeast Asia in the mid-1940s.[2] Events preceding World War II and even the Communist takeover of Russia in 1917, underlay older tensions between the Soviet Union, European countries and the United States.