Which of the following factors best explains the subjugation of the Plains Indians in the latter nineteenth century?
A. Increasing warfare among native tribes led to the intervention of the U. S. military.

B. Religious revivals among Native Americans encouraged their militant resistance and led to their defeat.

C. Religious revivals among Native Americans encouraged their militant resistance and led to their defeat.

D. Escalating conflicts between pioneering sodbusters and ranchers on the one hand and native tribes on the other resulted in forced removal of the latter.

E. The southern ideology of white supremacy drove the federal government toward a deliberate policy of extinction and genocide.