Due to the railroads, american settlers were able to travel west in larger numbers. how did this migration impact american indians?
a) american indians’ way of life changed because buffalo herds were destroyed for commercial markets.
b) american indians voluntarily went to reservations because they needed to find food and shelter.
c) american indians became cattle ranchers in order to survive a decrease in income.
d)american indians faced economic decline because they could no longer sell buffalo meat.