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It was due to so many combatants and number of countries fighting . At the peak of the war in 1942-43 over 38 countries with a combined population of 1.2 billion, had 48 million people under arm in the conflict. This, combined with new technology and the ruthlessness of Hitler, Stalin, Chang Kei Shek, Mao Tse Tung, is what caused the majority of the 72 million deaths.

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16y ago

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