This article is a comprehensive overview of the boarding school system in the United States. It includes origins of the school system, justification for forcing Native American children to attend school, cultural assimilation, and the eventual opposition to the boarding school system.
Sonja Keohane. “The Reservation Boarding School System in the United States, 1870-1928. June 3, 2008. http://www.twofrog.com/rezsch.html