I think its C because America enters the war when German started sinking there merchants ships.
Hi! I think there's no image of the chart but I'd like to answer about the Columbian exchange that might be the answer. The Columbian Exchange started was the widespread of trading of Americans and Afro-Asians and was followed by the voyage of Christopher Columbus to the Americas in 1492. They were exchanging plants, animals, technology, ideas, diseases and human populations.
Manifest Destiny
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Russia was the region that <span>sustained trade patterns that were the most different from the others before the eighteenth century.</span>
