Question

when did america entered in first world war​

Answer 1

In 1917, Germany, determined to win its war of attrition against the Allies, announced the resumption of unrestricted warfare in war-zone waters. Three days later, the United States broke diplomatic relations with Germany, and just hours after that the American liner Housatonic was sunk by a German U-boat.

Answer 2

The answer is

$6 \: april \: 1917$

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