Led to the loss of tribal lands and the erosion of Indian cultural traditions is the 1887 Dawes Act. As Indian were not considered as any part of the country.
The Dawes Enacted in order to realize Native Americans as individuals or as members of a tribe. It abolished tribal ownership and handed individual Native Americans land allotment, which were generally too small for individual agriculture.
As a result of the Dawes Act, more than 90 million acres of tribal ground have been transferred to non-Native Americans.
Thus, option A is correct.
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