<span>The first Battle of the Marne.</span>
Answer:
C. ( Colombian Exchange )
As Europeans traversed the Atlantic, they brought with them plants, animals, and diseases that changed lives and landscapes on both sides of the ocean. These two-way exchanges between the Americas and Europe/Africa are known collectively as the Columbian Exchange.
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The war brought full employment and a fairer distribution of income. Blacks and women entered the workforce for the first time. The war also brought the consolidation of union strength and far-reaching changes in agricultural life.