While I understand the appeal of unification to "Form X" country, right now I'm more interested in fragmenting big countries. Whereas there are tons of little states you can release from France, Austria, there aren't any that I can release from Castille. I mean, where's Leon? Spain was made from the unification of Castille, Leon, Aragon, and Navarre. Sure, Leon's been absorbed by 1399, but so had Guyenne in France. Doesn't mean they lose their claim, right?