 The rights of mixed-blood descendants to payments or a part in decisionmaking were not usually acknowledged.In 1830 the federal government acknowledged this problem by the Fourth Treaty of Prairie du Chien, which effectively set aside a tract of land for mixed-blood people related to the Oto, Ioway, Omaha, Sac and Fox and Santee Sioux tribes.The treaty granted these "Half-Breed Tracts" as sections of land in a form similar to Indian reservations.