World War 2 was the most expensive war in history. The overall economic cost of all countries involved is estimated to be at least 4 trillion dollars adjusted for today's inflation. It is believed that the United States had the greatest overall economic cost, followed by Germany, Russia, China, and the United Kingdom respectively. Exact figures are unknown due to the scale of the war and the surge of inflation, such as within the Unites States after the bombing of Pearl Harbor.
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