(June 18, 1934), measure enacted by the U.S. Congress, aimed at decreasing federal control of American Indian affairs and increasing Indian self-government and responsibility. In gratitude for the Indians' services to the country in World War I, Congress in 1924 authorized the Meriam Survey of the state of life on the reservations. The shocking conditions under the regimen established by the Dawes General Allotment Act (1887), as detailed in the Meriam report of 1928, spurred demands for reform.

Many of the Meriam report's recommendations for reform were incorporated in the Indian Reorganization Act. The act curtailed the future allotment of tribal communal lands to individuals and provided for the return of surplus lands to the tribes rather than to homesteaders. It also encouraged written constitutions and charters giving Indians the power to manage their internal affairs. Finally, funds were authorized for the establishment of a revolving credit program for tribal land purchases, for educational assistance, and for aiding tribal organization.

About 160 tribes or villages adopted written constitutions under the act's provisions. Through the revolving credit fund, many Indians improved their economic position. With the funds for purchase of land, millions of additional acres were added to the reservations. Greatly improved staffs and services were provided in health and education, with more than half of all Indian children in public school by 1950. The act awakened a wider interest in civic affairs, and Indians began asking for the franchise, which they had been technically granted in 1924.

The Reorganization Act remains the basis of federal legislation concerning Indian affairs. The act's basic aims were reinforced in the 1960s and '70s by the further transfer of administrative responsibility for reservation services to the Indians themselves, who continued to depend on the federal government to finance those services.