There’s a couple US culture maps out there. I like ones like this that break up the big regions into smaller sub-regions

I like the light bit of history this page gives, but I don’t feel like it’s kept up with our current affairs. https://robslink.com/SAS/democd83/us_regional_cultures_map.htm

Sounds a lot like the TerraFirmaCraft minecraft mod. Actually, after some light searching, it seems Vintage story was inspired by the Vintagecraft mod which was inspired by TerraFirmaCraft.