I would have said Texas, but it is a little iffy right now, so I will go with Oklahoma! It is like Texas-Lite!

Plus you have the Indian
Reservations as sovereign land, and you have a lot of caves and lakes!
TX, OK, KS, MO, AR are the top choices IMHO. Then comes Dixie, LA, MS, AL, GA, and N. FL, KY, TN, and the Carolinas. AZ, NM, CO, Utah, Montana, the
Dakotas, follow along nicely.