During world war i, the arrival of american troops boosted allied morale because they. a)refused to join to battle at the meuse-argonne.. b)provided more than one million reinforcements.. c)taught allied troops how to build trenches.. d)forced german troops to evacuate france and belgium.

B) provided more than one million reinforcements.

Americans arrived at a rate of 10,000 a day, and provided more than one million reinforcements. They were greeted enthusiastically by the tired Allied armies. The Americans were particularly important in the battles of Cantigny, Chateau-Theirry and Belleau Wood. The infusion of fresh troops strengthened the Allies' position and boosted morale.

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