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That's debatable because Germans used them a lot to prevent trade. Yet they are also 1 of the main reasons the United States entered the war. The United states entered the war because the Germans kept breaking the rules we set and didn't keep their promises with the submarine warfare. So the answer would be yes, they were one of the greatest impacts on World War 1.

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11y ago
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Q: Did submarines have the greatest impact on World War I?
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