Aside from Martians who would be most likely rejected (they more belong to late 19th century), I have a few other ideas such as:

- Yllendthyr in the 18th century (elvish empire with a few peculiarities)
- Dwarven Workers Union (pre-communist, semi-freemasonist nation of mountain dwelling dwarves)
- Gorilla France (with their new dictator being Gorillaparte Ripaparteon)
- Orks/trolls with more industrialist attitude

And a bunch of others. I am rather torn at exactly which I should choose.
Perhaps I can pick Yllendthyr as the safest bet. Then I would pick spain and some colonies.