Conversation so far:
What is Caddoan Mississippian regarding Mississippian culture?
The Caddoan Mississippian area is a regional variant of the Mississippian culture.
What type of variant of the Mississippian culture was Caddoan Mississippian?
The climate in this area was drier than areas in the eastern woodlands, and the lower population on the plains may have meant fewer neighboring competing chiefdoms to contend with.
What does the Caddoan Mississippian section of the Mississippian culture article say about Mississippi?
Living on the western edge of the Mississippian world, the Caddoans may have faced fewer military threats from their neighbors.
Are there any other interesting aspects about the Mississippian culture article besides the Caddoan Mississippian section?
The Caddoan Mississippian area covered a large territory, including what is now eastern Oklahoma, western Arkansas, northeastern Texas, and northwestern Louisiana.

Question: Any other states?
Self-contained rewrite: Did the Caddoan Mississippian area cover any other states besides what is now eastern Oklahoma, western Arkansas, northeastern Texas, and northwestern Louisiana?