How did the open range system benefit ranchers during the western cattle boom

The correct answer is:

During the western cattle boom, the open range system allowed ranchers to graze herds on the open range, meaning public land once owned by the Plains Indians and their buffalo herds.

The western cattle boom brought thousands of settlers, mostly cattle ranchers that used the grasslands of the Great Plains to raise and sell cattle. The subsequent economic growth added to America's ascent to power.

the awenser wuold be slaves

the answer is 1.. i think