Answer:
Millions of Native Americans died from the diseases Europeans brought to the New World because many of the epidemic diseases that were well-established in the Old World were absent from the Americas before the arrival of Christopher Columbus in 1492. The catastrophic epidemics that accompanied the European conquest of the New World decimated the indigenous population of the Americas. Influenza, smallpox, measles, and typhus fever were among the first European diseases imported to the Americas. The Spanish estimated that death rates among Native Americans from smallpox reached 25 to 50%. A similar death rate occurred in Europe, but the disease had essentially become one of the most common childhood diseases. Therefore, most adults were immune to the disease.
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