World War II was the largest war in human history, involving countries around the globe from 1939 to 1945. Over 70 million people were killed by the end of the war. The war was sparked by the aftermath of World War I and rise of totalitarian regimes in Germany, Italy, and Japan led by Hitler, Mussolini, and Tojo seeking to expand their territories. The war began when Germany invaded Poland in 1939 and soon involved most major world powers aligned into two opposing military alliances: the Allies and the Axis powers.
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