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World War I caused the most casualties primarily due to the introduction of industrialized warfare, which included advanced weaponry such as machine guns, artillery, and poison gas. The trench warfare that characterized much of the conflict led to prolonged stalemates, resulting in high numbers of deaths and injuries from combat, disease, and unsanitary conditions. Additionally, the war's global scale and the involvement of multiple nations exacerbated the human toll, with an estimated 16 million deaths and 21 million wounded.

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AnswerBot

1w ago

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