The document summarizes the expansion of American settlers into Native American lands between the Mississippi River and the Pacific Ocean in the 1800s, and the conflicts that arose. It describes how both the U.S. and Canadian governments confined indigenous peoples to reservations and tried to assimilate them through education, while the U.S. pursued a more violent policy of war and removal. It discusses several Native American resistance efforts, including the 1862 Sioux war, the Sand Creek Massacre, and the Battle of Little Bighorn in 1876, before concluding that the violence resulted from Native attachment to ancestral lands containing resources desired by settlers.