Asymmetric regionalism in Spain

Let us state some starting points. I use the term ‘Spanish federalism’ rather than Spanish regionalism, because I mean a broader sense for federalism. Actually, I like better its comprehension, as Friedrich ¹ described it more than half a century ago, as an historical process of decentralisation. That is, a dynamic process in which centripetal and centrifugal forces reach different and changing points of equilibrium in a constitutional framework that guarantees at the same time a territorial political self-government and the existence of a minimum central government.