Why Ryukyu?

[Stategem161803]

Ck2 was my first paradox game and I've never played any EU games other than EU4 so I'm not yet fully assimilated into the EU society. I have to ask, why the special treatment for Ryukyu? Why is it considered the hardest nation to do a WC with? Or at least, why does it have it's own achievement?

Certainly any of the New World nations would be harder. Is there some history or inside joke there I don't know about?

 

[VolitionNewlove]

For the record, the hardest nation is Chimu.

 

[keneticpest]

Ryukyu has one of the worst starting positions in the game. It's animist religiously, their one province has an extremely low base tax, and they have so little manpower. While Ryukyu isn't the hardest nation, (I'd say Chimu or Albania beat it by a long shot), it has a little soft spot in the players looking for a very big challenge, especially those who played EU:III (Or maybe it was EU:II?)