As for the Americas, here are my ideas:
Brythonic colonial successor-state in the Caribbean, Italian state in the north, based around New York (also an opportunity for much fun). New Swabia in our-world Deep South and Texas, slave-owning, lots of tensions. Greek state in Mexico. Democratic Russians up in Alaska, Norse state in Canada (still following Odin and Thor (though I haven't modded their religion in yet)).
As for other ideas - East Slavic Islam-esque religion, Zoroastrianism, Mongol horde in southern Siberia, Central Asia, China.
And here are some screenshots of my latest work: