The world is still waiting for Serbs to apologise for the 1941 coup which doomed the balkans to war, especially since the Banovina of Croatia became technically a state within a state with perfect borders. Couple that with four decades of communist brainwashing and you get Serbs who hated the Kingdom because they were being tard wrangled from chimping out and Croats who think it was some greater Serbia scheme, not realizing the good deal we had shortly before the war began. The Kingdom of Yugoslavia was a good state with some growing pains and no ammount of serb chimping and croat schizoing is gonna change that.