The Balkans is a crazy place. Serbs, Croats, and Bosnians are basically the same people but with different religions. The only language difference is that Croatians use Latin letters and Serbs use Cyrillic but don't tell either group it's the same language. The Romans, Byzantines, Turks, and Tito held the region together pretty well, but without them to keep the tribes in check, they quickly started killing each other. Of course, it didn't help that the Saudis funded Wahhabi mosques in the region and started radicalizing the Muslims. Bosnian Muslims ate pork and drank with their neighbors for centuries until the fundamentalists showed up according to my friend that spent time in both Bosnia and Kosovo in the 90s.