orygin

Belgium. The current country was founded in 1830. We have Wallonia and Flanders who speak different languages, each province has or had its own dialect but it has merged mainly into french and dutch, with a bit of German in the east. The country itself is probably smaller than any us state, but I don’t know all the sizes of them.
Funnily enough, there is a small town in the US with Belgian immigrants that still speak older dialects of Walloon.

Less than 200 years old. And we have 3 languages, a huge cultural divide between the north and south, and more diversity in our provinces than in between us states.