The U. S.' entry into WWI was important because the infusion of new blank
broke the blank

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The entry of the United States was the turning point of the war, because it made the eventual defeat of Germany possible. It had been foreseen in 1916 that if the United States went to war, the Allies' military effort against Germany would be upheld by U.S. supplies and by enormous extensions of credit.

Explanation:

it was the first major victory for the colonists.