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Alliances was signed and if one alli declares war first than the other country goes into war.

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13y ago
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Anonymous

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4y ago

The United States entered war because a telegram from Germany was intercepted by the British saying that Germany wanted Mexico to join them in the war. Russia also removed the last obstacle keeping America from entry by the fall of the tsar.

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Q: What caused the United States to enter World War 1?
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What caused United States to enter World War 2?

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