Cultural assimilation of Native Americans in the context of "Native American boarding schools"

Native Americans (also called American Indians, First Americans, or Indigenous Americans) are the Indigenous peoples of the United States, particularly of the lower 48 states and Alaska. They may also include any Americans whose origins lie in any of the indigenous peoples of North or South America. The United States Census Bureau publishes data about "American Indians and Alaska Natives", whom it defines as anyone "having origins in any of the original peoples of North and South America ... and who maintains tribal affiliation or community attachment". The census does not, however, enumerate "Native Americans" as such, noting that the latter term can encompass a broader set of groups, e.g. Native Hawaiians, which it tabulates separately.

The European colonization of the Americas from 1492 resulted in a precipitous decline in the size of the Native American population because of newly introduced diseases, including weaponized diseases and biological warfare by colonizers, wars, ethnic cleansing, and enslavement. Numerous scholars have classified elements of the colonization process as comprising genocide against Native Americans. As part of a policy of settler colonialism, European settlers continued to wage war and perpetrated massacres against Native American peoples, removed them from their ancestral lands, and subjected them to one-sided government treaties and discriminatory government policies. Into the 20th century, these policies focused on forced assimilation.

The Dawes Act of 1887 (also known as the General Allotment Act or the Dawes Severalty Act of 1887) regulated land rights on tribal territories within the United States. Named after Senator Henry L. Dawes of Massachusetts, it authorized the President of the United States to subdivide Native American tribal communal landholdings into allotments for Native American heads of families and individuals. This would convert traditional systems of land tenure into a government-imposed system of private property by forcing Native Americans to "assume a capitalist and proprietary relationship with property" that did not previously exist in their cultures. Before private property could be dispensed, the government had to determine which Indians were eligible for allotments, which propelled an official search for a federal definition of "Indian-ness".

Although the act was passed in 1887, the federal government implemented the Dawes Act on a tribe-by-tribe basis thereafter. For example, in 1895, Congress passed the Hunter Act, which administered the Dawes Act among the Southern Ute. The nominal purpose of the act was to protect the property of the natives as well as to compel "their absorption into the American mainstream".

Indian Territory and the Indian Territories are terms that generally described an evolving land area set aside by the United States government for the relocation of Native Americans who held original Indian title to their land as an independent nation. The concept of an Indian territory was an outcome of the U.S. federal government's 18th- and 19th-century policy of Indian removal. After the American Civil War (1861–1865), the policy of the U.S. government was one of assimilation.

Indian Territory later came to refer to an unorganized territory whose general borders were initially set by the Nonintercourse Act of 1834, and was the successor to the remainder of the Missouri Territory after Missouri received statehood. The borders of Indian Territory were reduced in size as various Organic Acts were passed by Congress to create organized territories of the United States. The 1906 Oklahoma Enabling Act created the single state of Oklahoma by combining Oklahoma Territory and Indian Territory, ending the existence of an unorganized independent Indian Territory as such, and formally incorporating the tribes and residents into the United States.