How did the US contribute to the economic problems of Europe?

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explanation:

c. troops marched forward in close formation against newer, more accurate weapons

on april 6, 1917, the u.s. joined its allies--britain, france, and russia--to fight in world war i. under the command of major general john j. pershing, more than 2 million u.s. soldiers fought on battlefields in france.

the answer is a. hope this