In this timeline, Italy goes after the new formed state of Yugoslavia due to not gaining Dalmatia after the great war, this new state who is already having internal problems starts to disintregrate. Italy cooperates with the Slovenian seperatists but go on to treat the Croatian seperatists as enemies due to territories beig contensted. During all of this, the Hungarians and Germans of Vojvodina manages to rise up and control a somewhat large area in the north.
I'm well aware for Yugoslavia being called the the kingdom of serbs croats and slovenes, but I personaly like the name Yugoslavia better. This is all fiction and is not suppose to offend anyone