What happened to the more than 4 million Native American populations after the arrival of Europeans?

Question

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The arrival of Europeans brought with them diseases, such as smallpox and influenza, to which Native Americans had no immunity. The disruptions brought by Europeans, such as warfare, land loss, and forced migrations, also contributed to a significant reduction in Native American populations. Estimates suggest that the Native American population decreased from approximately 4 to 5 million in 1492 to less than a million in the late 19th century.

What Happened to the More Than 4 Million Native American