D. mound builders
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Native American populations were decimated by diseases that had been brought by the Europeans.
Explanation:
When the Europeans discovered and settled in the New World, lot of changes occurred on both sides of the Atlantic. Many things were positive, especially when it came to exchange of goods, plants, and animals. Unfortunately, there were some negatives in it, with the spreading of diseases being among the most influential. The exchange between the two sides is known as the Columbian exchange.
The Europeans and the Native Americans had some diseases that were unique about them, and their immune systems were adapted to them, but they didn't had response for the diseases of the opposite side. Both sides suffered from this, but the effect was much greater among the Native Americans, as the majority of their populations died out because of the spreading of European diseases among them, such as the common cold and the smallpox.
Other negatives that occurred were:
- numerous wars
- systematic assimilation and genocide
- overtaking of territory
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The water is evaporating because of the Eastern sun
