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Answer: Researchers estimate that there were 15 million to 20 million American Indians in the territory that would become the United States at the time of first contact with European explorers in the 15th century.
Explanation:
Julien de Lallande Poydras Credentials
Answer:
The theory of planetary motion developed by Nicolaus Copernicus
Explanation:
The south made their living with agricultural, and needed people to pick cash crops for cheap. they found that they made great profits having slaves, as they picked without pay
