Spain is following exactly the same pattern that all other western countries are going through.  The political divide is no longer between left and right, the continuum that was formed in the French Revolution and has lasted over 200 years. The divide is now between insiders and outsiders. Insiders include all mainstream political parties, all government civil servants, the institutions of state, education and church, and big business. Centre right parties are being decimated everywhere, and rightly so. The outsiders are labelled far-right or populists or deplorables etc by the insiders. The outsiders confuse and scare the insiders. They are actually made up of people that have, under the old left/right divide, a range of political views. This is behind Trump, Brexit,  gilet jaunes, Hungary, Italy, Alternative for Deutschland and now, the so-called far right extremist party in Spain. The story in Spain is not so much the socialist win, as that was expected, it is the weakness of it in the face of the rise of the ‘far-right extremists.’