What was the effect of entry of the United States into World War I in April 1917?

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The entry of the United States into World War I gave the nearly defeated Allied Powers a psychological boost. The American army and resources provided much-needed assistance to the Allies, but it took several months for the United States to mobilize its forces and make a significant impact on the war effort. The German naval staff was not particularly afraid of the United States' entry into the war, as Germany had a naval advantage at the time. Turkey had actually entered the war on the side of the Central Powers two years prior to the United States' entry.

What Was the Effect of Entry of the United States