At least some of the Caddo's ended up in OK. I grew up in Caddo County OK, adjoining counties are Kiowa, Comanche. There are also towns named Apache, Arapaho and so on. These are close to Lawton OK where Fort Sill is located. That is where Geronimo was imprisoned for a time. There is still a large population of Indians in the area. In fact Anadarko which is the county seat of Caddo County calls itself the Indian Capitol of the the world. One of the attractions is Indian City with a museum and other exhibits. There is a large parade and celebration every year to celebrate Indian hertiage. Most of the Indians in this area were the Plains Indians. When the area was opened to settlement every one who could establish their Indian blood was given 160 areas of land. This included each child. Much of this land is still in the hands of the descendents of the orginal owner. Incidently if it was an Indian grant and remains in the family and not sold they pay no property taxes of any kind on it.