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What was the negative effect of the Columbian Exchange on the Americas?

The trade of crops such as sweet potatoes, peanuts, and malze (corn) with England brought little money.
The crops from the Eastern Hemisphere did not grow as well in the Western Hemisphere.
The introduction of diseases for which the Native Americans had no immunity killed thousands.
The introduction of unfamiliar livestock such as pigs, horses, sheep, and cows harmed the llama's environment.

1 Answer

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The answer is that the introduction of diseases for which the Native American had no immunity killed thousands
User Jpprade
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