Answer:
It was caused by diseases
Explanation:
The people of the Americas had never been exposed to such infectious diseases as measles and smallpox. Without any resistance to those diseases, they were helpless and died in huge numbers. This is the most important impact of the exchange because of the fact that it was so devastating to the native population.
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Communities with war industries experienced an immediate labor surplus when those industries closed down, and the large numbers of returning soldiers added to the unemployment problem.
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Always yield to the right of way to vehicles
