The Indian Claims Commission (ICC) was a judicial relations arbiter between the United States federal government and Native American tribes.
The commission was conceived as way to thank Native Americans for their unprecedented service in World War II and as a way to relieve the anxiety and resentment caused by the United States' history of colonization of indigenous peoples.
Together with the law, the Commission created a process for tribes to address their grievances against the United States, and offered monetary compensation for territory lost as a result of broken federal treaties.
This limitation on the authority of the ICC was resented by many tribal peoples, who wanted the return of their lands more than money—e.g., the Pit River Indians of northern California, and the Teton and Lakota of the Black Hills, South Dakota.
In a few instances, by way of settlement acts, tribes gained some monetary funds to buy acreage when they had no communal land (as with the Penobscot and Passamaquoddy of Maine and the Catawba of the Carolinas).
[6] In preparing expert testimony for litigation brought by the tribes as plaintiffs or for the defense by the U.S. government, researchers explored all forms of data, including the earliest possible maps of original title—i.e., native or indigenous—territory and the cartographic presentations based upon treaties, statutes, and executive orders—generally identified as recognized title.
In most cases, recognized title lands could be more easily demonstrated in litigation, while native territory depended upon Indian informants, explorers, trappers, military personnel, missionaries and early field ethnographers.