This is one of my favorite AH cliches, but I'm curious as to how plausible it actually is.
During the Great Depression, could the U.S. federal government have been taken over by some sort of dictator, junta or radical political party? It seems like the balance of power makes this difficult - look at the trouble F.D.R. Administration (not a dictatorship, but a robust Executive branch) had accomplishing his agenda in the Depression of OTL.
P.O.D. can be as early as 1900 (or possibly earlier, if the need be) but I'd like to avoid any major butterflies prior to 1929. I'd like this timeline to be semi-recognizable before it goes horribly wrong.