apr 6, 1917 - World War I

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America entered World War One on April 6th, 1917. Up to that date, America had tried to keep out of World War One – though she had traded with nations involved in the war – but unrestricted submarine warfare, introduced by the Germans on January 9th, 1917, was the primary issue that caused Woodrow Wilson to ask Congress to declare war on Germany on April 2nd.

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