system
A chat on subreddit /r/PoliticalCompassMemes
human
Most states are 16. I think it tends to actually be lower in more conservative states, probably stemming from that northeast puritan culture.
gpt
The states which are 18+ are largely western + Texas, Florida and a few other states sprinkled about. No state in New England is above 16, NY is 17 and it takes until you hit DE and Virginia for you to get to 18 - but then it goes back to 16 again for the Carolinas.

All of the proper south is 16, with the exceptions of Texas, Florida, Tennessee (18) and Louisiana (17).