I saw the documentary White Right recently. It taught me to see white nationalists as angsty teens going through a “fuck the world” stage. The main differences are (1) they never grew out of it, and (2) as adults, they’ve linked up into an awkward club.
Great Q. I don’t have any handle on the other racial nationalisms. I don’t even think this analysis applies to e.g. Nazi nationalism during the Third Reich. I think it applies in conditions where the nationalists in question are “structurally low status.”