 The remaining western portion of the former Indian Territory became the Oklahoma Territory.The Oklahoma organic act applied the laws of Nebraska to the incorporated territory of Oklahoma Territory, and the laws of Arkansas to the still unincorporated Indian Territory (for years the federal U.S. District Court on the eastern borderline in Ft. Smith, Arkansas had criminal and civil jurisdiction over the Territory).The concept of an Indian territory is the successor to the British Indian Reserve, a British North American territory established by the Royal Proclamation of 1763 that set aside land for use by the Native American people.