Yep, all Rival casinos accept players from all 50 states.
You should also check Affiliate Guard Dog to make sure the program has affiliate-friendly T&Cs.
Here is my list of profitable and reputable casino affiliate programs.
Of these, only 5 accept players from all 50 states: SlotoCash, Main Street, CWC Affiliates, Casino Coins, and 400 Affiliates.
Good luck! :thumbsup: