When did the U. S. enter World War I and what countries were on the same side as the U. S.?

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On April 6, 1917, the U.S. joined its allies--Britain, France, and Russia--to fight in World War I.

Explanation:

On April 6, 1917, the U.S. consolidated its allies, Britain, France, and Russia to fight in World War I. Under the authority of Major General John J. Pershing, more than 2 million U.S. soldiers persisted on battlefields in France. Many Americans were not in favor of the U.S. enrolling in the war and desired to remain neutral.

Explanation:

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