Why did the U. S. Government want to drive the Sioux off their land?

The United States government set out to establish a series of Indian treaties that would force the Indians to give up their lands and move further west onto reservations. ... Once gold was found in the Black Hills, miners were soon moving into the Sioux hunting grounds and demanding protection from the United States Army. hope this helps

religion was the center of there society they practiced human sacrifices and which they believed kept there god strong and that he would keep bad guys away hope this