When European explorers first arrived in the Americas, they brought new diseases with them. These diseases spread
to indigenous people, leading to many deaths.
What is this an example of?
O A. Historical sourcing
B. Historical causation
O C. Historiography
D. Historical correlation

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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