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| | World War II |
 | | World War II was the most extensive and costly armed conflict in the history of the world, involving the great majority of the world's nations, being fought simultaneously in several major theatres, and costing tens of millions of lives. |
 | | Indeed, the first combat operation in the European Theater of World War II was a German bombing attack against Poland, while the last combat operation in the Pacific Theater was a thousand-aircraft bombing attack on Japan, on 14 August 1945. |
 | | The war also saw the re-emergence of the United States from its isolationism, the destruction and rebuilding of Germany and Japan into major industrial powers, the advent of the atomic bomb, and the emergence of the United States and the Soviet Union as global superpowers. |
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