AHC: Second American Civil War

For those unfamiliar with the Kaiserreich mod of Hearts of Iron, it is a CP victorious scenario. Other than the ridiculous assertion that the war could last until 1921 (WTF?) and somehow Germany and her allies achieved a 'peace with honor,' the mod suggests a second civil war in the US after 'Black Monday,' the fall of the German stock market. My question - using a pod no earlier than 1918 (I refuse on principle to accept the war lasting until 1921), how could we arrive at a situation where the US finds itself 'brother against brother' once more?
The Kaiserreich mod has four factions for the US: the Unionists (loyalists), the socialists, the western states, and the corporatists (?)

thoughts?
 
I think the gist of the scenario could be made plausible; something like Jello's "more viable socialist movement, which gains the presidency during a *Great Depression, and Capitalism panics." It's low probability IMO, but I'm picturing something like the reaction in France to the Popular Front's Victory in 1936.

...which led to, ultimately, more elections were they lost and stepped down gracefully. But it's probably a start.
 
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