The 20 Kingdoms are currently part of the World Government
The Ethanbarons ruled a different unnamed kingdom but Nusjuro still likely has Wano connections
Guys it’s just a theory, I’m not asking a question I’ve read the manga and I know the facts but what I’m saying here is that 900 years ago, the monarchs of Wano weren’t the Kozuki but were the Ethan Baron family while the Kozuki were the sword-smiths/stonemasons(that’s where the skills of constructing the poneglyph comes from) of the Ethan Baron and they designed the first Kitetsu blade for the last Ethan Baron Shogun of Wano. My theory is that the Ethan Baron joined Imu against the Ancient Kingdom while the Kozuki were secretly allies with Joy Boy and that once the Ethan Baron went to Mariejoa, the Kozuki took over and closed the borders of Wano instead of joining the government.
Which is why I think Nasujuro will fight Momonosuke in the final War.
I believe it was a similar scenario with Elbaf, the Figarlands were the original Monarchs of the Kingdom until right after the war and as soon as their ascension into Godhood(world nobles) Loki/Harald’s ancestors took over and then somehow turned the island/citizens into giants using Biblio’s abilities or some other ancient kingdom technology of gigantification and also isolated themselves that way
And while I understand that Elbaf worships Nika, I don’t believe Nika actually existed but the ancient kingdom used the legend to create the devil fruit which joy boy wielded. He was from the ancient kingdom and not Elbaf.