What factors led to the decreased Native American population by more than 80 percent from 1850 to the 1870s a. They lost their land and freedom c. they were unable to make a living b. many were murder?

The Native American population decreased by over 80 percent from 1850 to the 1870s due to a combination of factors, including violent conflicts, forced removal from their ancestral lands, and the devastating impact of diseases brought by European settlers. Many tribes were forcibly relocated to reservations, which severely limited their ability to sustain their traditional ways of life and make a living. Furthermore, widespread violence, including massacres and systemic oppression, contributed significantly to their population decline during this period.