If Yugoslavia can break up, why can’t Spain?
Because the globalist and banking interests that have turned a common market into a take-over of Europe want the more productive Catalonians and Basques to subsidize the less productive regions.
Croats are mostly Roman Catholic.
Serbs are mostly Orthodox...
people have the right to self governance
Muslims, Eastern Orthodox, and Catholics have been murdering one another since the time of the Ottomans and the Habsburgs. There is no similar murderous ethnic hatred between Castillians vs. Catalans or Basques (in spite of a minority fringe of the ETA that most Basques oppose).
I think a Spanish breakup would have little consequence. One of the reasons for uniting a larger country is security. Nobody is about to invade Spain, on the far side of the Pyrenees. And, even a split-up Spain is strong enough to defend against African refugee invader influx across Gibraltar... if they choose to do so.
Yugoslavia was an artificial state created at the Treaty of Versailles to encompass the Slavic peoples of the Balkans that had formerly been part of the Austro-Hungarian or Ottoman Empires. It was only held together by brute force, specifically the Tito Communist dictatorship for 40 years after World War II. When Communism collapsed, so did Yugoslavia. OTOH, Spain has been a unified nation for over 500 years, not unlike Britain, where minority nationalities like the Scots and the Welsh were subject to the dominant nationality in a geographic entity defined by bodies of water, and in Spain’s case, partially by a mountain range. Even Portugal fell under Spanish rule for periods of time.