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The US entered WW1 the last yr, which means 1917-1918.

The United States declared war on Germany on April 6, 1917, thus entering WWI.

America entered after the sinking of the Lusitania off the Irish coast by German u-boats when 3,000 U.S. citizens were killed.

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12y ago
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13y ago

United States entered World War 1 (WWI) in 1917 after the Lusitania was sinked

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13y ago

The United States issued a formal declaration of war on April 6, 1917.

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11y ago

In 1917.

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12y ago

1918

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14y ago

1917

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Q: When did America enter the First World War?
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