answer:I found this on Wikipedia and it might help as an Land Tenure and Federal Indian Law With the establishment of reservations, tribal territories diminished to a fraction of original areas and indigenous customary practices of land tenure sustained only for a time, and not in every instance. Instead, the federal government established regulations that subordinated tribes to the authority, first, of the military, and then of the Bureau (Office) of Indian Affairs. Under federal law, the government patented reservations to tribes, which became legal entities that at later times have operated in a corporate manner. Tribal tenure identifies jurisdiction over land use planning and zoning, negotiating (with the close participation of the Bureau of Indian Affairs) leases for timber harvesting and mining. Tribes generally have authority over other forms of economic development such as ranching, agriculture, tourism, and casinos.