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This may be asb territory but I know Hungarians weren't happy about WW1 and being dragged in by the Austrians suppose they rise up? Could it be possible for an alt WW1 where early on Austrian troops have to deal with Hungary then in the post war there's no Trianon the Austrian part of the empire is dismantled still but Hungarians keep all of their country including the potentially unhappy about the situation croatians. Or maybe it becomes the Hungarian Federation with autonomy for Croatia and Slovakia as well as the Romanian regions of Transylvania.