How did american entry into World War one affect the Allied powers

It had boosted their morale.

Explanation:

The U.S. troops arrived just in time to turn the tide of the war in favor of the Allies. Both sides were exhausted and running out of soldiers. The influx of fresh troops helped to boost the morale of the Allies and played a major role in the defeat of the Germans.

boosted their morale

Explanation:

How did American entry into World War I affect the Allied Powers? It boosted their morale. During World War I, the zigzag pattern of trenches on the front lines was designed to protect troops from enemy fire. During World War I, most attacks in no-man's-land led to stalemate

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answer: born in saint-dié, in the vosges department, france, he studied law, and was called to the bar at paris in 1854,[2] but soon went into politics, contributing to various newspapers, particularly to le temps. he attacked the second french empire with great violence, directing his opposition especially against baron haussmann, prefect of the seine department. a series of his articles in le temps was later republished as the fantastic tales of haussmannlaxupa (1868).[2]

explanation: