>"To people who feel deprived of a clear social identity, Ur-Fascism says that their only privilege is the most common one, to be born in the same country. This is the origin of nationalism."
Yep, the birth of fascism, ie. Italian fascism, was a final act of the Italian national independence process which started in the first half of 19th century. The independence from Austrian empire and from Catholic Church - Mussolini in particular finalized the relationships with papal states/Vatican.
Interesting that Mussolini started as Socialist and split with them on very similar grounds as the "bolsheviks"/Lenin split from Socialists in Russia around the same time - push for more forceful action, for unchecked power (dictatorship) - the difference being that in Russia Lenin was pushing for dictatorship of the working class while Mussolini was for dictatorship of the national state. While one may say that whose ideologies are of different colors, structurally they are the same and thus produced similar results - totalitarian states.
As an example, just replace national dimension with the "aristocracy - capitalists - worker class/peasants" dimension in the 2 quotes above and you'll get the socialist/communist principle of the "class war" and that idea that just by being of "working class" makes people intrinsically good and thus gives them moral power and entitles them to [dictatorially] rule and decide the fate of others.