Look up the "Home of the Brave" submod. It adds tons of paths for a few more civil war factions like bonafide Dixiecrats+Klansmen (and some industrialists) and a black rebellion in the deep South if said faction goes even more extremist. It also tries to make the characters more "historically accurate", like Pelley being mostly a weirdo Christian occultist with strange racial ideas rather than a true fascist.To elaborate on my previous comment, I can perhaps see a case for appreciating the historical symbol of Huey Long as an economically progressive and unusually non-racist southern politician for his time (although the characterization of Huey Long as 'anti-racist' or even less racist than his colleagues is somewhat up for debate, especially in recent years : [content warning : racial slurs]
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The fact of the matter is, however, that I simply cannot see any good reason to support Huey Long in the Kaiserreich Universe. For one, all of his economic policies can be done better by the CSA. Additionally, if you're adamant on retaining social democracy, I'm fairly sure the PSA has a social democrat route. Both the CSA and the PSA have infinitely more potential for democracy than the AUS, which is essentially doomed to some flavor of autocracy, ranging from a oligarchical welfare state to a nightmarishly racist abomination. Far from being the supposed anti-racist in our own timeline, Long sides with White Supremacists as well as literal Business elites, the latter of which hilariously seems to contradict his own supposedly economically populist positions.
At the end of the day? Even though I'm no fan of the guy, I feel like Long could be portrayed a lot better and more sympathetic in Kaiserreich, especially by ridding him at least of the support of the business elites.