Possibly ewery existing and at some point independent and even non ever existent or in some cases custom made country can be released if you play austro hungary Just greater hungary not . Even austria can and even in diferent ways... but no way to have greater hungay as hungarian kingdom released with its crown terrytories.. you can release for instance slovakia czech republik or czechoslovakia return teritories to kingdom of romania but if it comes to hungary then only litle todays hungary can be released... You can even return claims to other countries but if you release hungary... no sure you cant give them back not even the core provinces... and of course transilvania banat and nortern transilvania has no claims and no hungarian cores on them for some weird reason...Could it be made possible ? So if i want to create an alternative history in game for this case and play as this i do not have to look for ingame files or use command prommpt ? or you just plain hate hungary hungarians and ewery one who wants to play as greater hungary ? \Atleast i see no other possible explanation why you can release even moravia but not one of the major constituent part of austro hungarian empire. and yes majority of those territories where under the hungarian crown so it would be really nice to have it possible...