Who benefited most from the removal of the Native Americans from the Great Plains? Explain why

Indian removal was a forced migration in the 19th century whereby Native Americans were forced by the United States government to leave their ancestral homelands in the eastern United States to lands west of the Mississippi River, specifically to a designated Indian Territory (roughly, modern Oklahoma). Native American removal would reduce conflict between the federal and state governments. It would allow white settlers to occupy more of the South and the West, presumably protecting from foreign invasion.

Militarism is the answer.