Under the history of U.S. treaty law, the territorial boundaries claimed by federally recognized tribes received the same status under which the Southeastern tribal claims were recognized; until the following establishment of reservations of land, determined by the federal government, which were ceded to the remaining tribes by "de jure" treaty, in a process that often entailed forced relocation. The establishment of the Indian Territory and the extinguishment of Indian land claims east of the Mississippi anticipated the establishment of the U.S. Indian reservation system. It was imposed on remaining Indian lands later in the 19th century.