Diseases introduced by the Columbian Exchange caused a sharp decline in population levels in the Americas beginning in the 15th century. The correct option among all the options given in the question is option "C". The natives never faced the diseases that attacked them and so they did not have any cure for them. <span />
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The United States now took the position that no Native American group would be treated as an independent nation. More and more of their land was converted to reservations or seized. ... In 1887, the Dawes Act made the US government responsible for the distribution of land in reservations.
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