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. The act allowed tribes the option to sell the lands that remained after allotment to the federal government. 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 Dawes "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."Native peoples who were deemed to be "mixed-blood" were forced to accept U.S. citizenship, while others were "detribalized." Between 1887 and 1934, Native Americans "lost control of about 100 million acres of land" (United states has 1.9 billion acres of land ) or about "two-thirds of the land base they held in 1887" as a result of the act. The loss of land and the break-up of traditional leadership of tribes produced negative cultural and social effects that have since prompted scholars to refer to the act as one of the most destructive U.S. policies for Native Americans in history.The "Five Civilized Tribes" (Cherokee, Chickasaw, Choctaw, Muscogee, and Seminole) in Indian Territory were initially exempt from the Dawes Act. The Dawes Commission was established in 1893 as a delegation to register members of tribes for allotment of lands. They came to define tribal belonging in terms of blood-quantum. But, because there was no method of determining precise bloodlines, commission members often assigned "full-blood status" to Native Americans who were perceived as "poorly-assimilated" or "legally incompetent," and "mixed-blood status" to Native Americans who "most resembled whites," regardless of how they identified culturally.The Curtis Act of 1898 extended the provisions of the Dawes Act to the "Five Civilized Tribes," required the abolition of their governments and dissolution of tribal courts, allotment of communal lands to individuals registered as tribal members, and sale of lands declared surplus. This law was "an outgrowth of the land rush of 1889, and completed the extinction of Indian land claims in the territory. This violated the promise of the United States that the Indian territory would remain Indian land in perpetuity," completed the obliteration of tribal land titles in Indian Territory, and prepared for admission of the territory land to the Union as the state of Oklahoma.The Dawes Act was amended again in 1906 under the Burke Act.

During the Great Depression, the Franklin D. Roosevelt administration passed the US Indian Reorganization Act (also known as the Wheeler-Howard Law) on June 18, 1934. It prohibited any further land allotment and created a "New Deal" for Native Americans, which renewed their rights to reorganize and form self-governments in order to "rebuild an adequate land base."