Between 1939 and 1945, the world was engulfed in a conflict fought on almost every continent and ocean, involving every world power, and ultimately costing more than 50 million people, both soldiers and civilians, their lives. More than a dozen nations, among them the United States, Great Britain, and the U.S.S.R, fought on the side of the Allies, joining forces against the Axis powers—primarily Germany, Italy, and Japan—who, at the apex of their power, controlled or were poised to control large swaths of Europe, Africa, the Pacific Ocean, and East and Southeast Asia. Perhaps the greatest difference between World War II and the wars and conflicts that preceded it was its ubiquity.
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