THE CATALAN ‘QUESTION’ : POPES & ROYALS ALBIGENSIAN CRUSADE 1209, WAR OF SICILIAN VESPERS & MULTIPLE EXPULSIONS & SAVAGE INQUISITIONS INCL. 1492 TO DIVIDE CATALAN COUNTRIES WITH TREATY OF UTRECHT 1713 CULMINATED IN HOLOCAUST (13.04.2018)
The Popes and royals were so determined to centralize governance using the false banner of 'nationalism' (because the Popes and Royals have never stayed within any 'national' borders themselves) they did everything they could to divide the more multicultural Catalan countries around the Mediterranean.
... the witness...
The Albigensian Crusade did start 'the sequence of events' that divided Catalan countries around the Mediterranean culminating in the Holocaust.
I think Mediterranean transnational, libertarian EU Association & plurilateral agreements under the jurisdiction of the ECJ with the decentralisation of political power will probably be the future of progressive administrative governance.