Abstract
Since the return to democracy, the negotiations on decentralisation of policies and decision-making developed with the framework of Comunidades Autónomas had been intended as a way of dealing with the existent tensions between Spanish and regional nationalisms. However, the escalation of the tension between regions reached a new level with the unofficial referendum in Catalonia over potential independence from Spain in October 2017 together with the increase in support for the first time in 40 years for a Spanish extreme right-wing party, VOX. The reasons behind both the support for VOX and the support for Catalonian independence can be linked to the degree of discontent over regional and Spanish nationalistic ideas respectively.