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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~courtney

he believed that strong monarchies would lead to social and political stability.