And those complex myriad of factors were existent already -if some not as advanced- (monopolization, big business, corruption, abuse of the working class, and so forth), save for the Recessions of the 1890's (Panic of 1893). And you can jump start "Progressivism" (we'll treat this as a relative term as this is alternate history) given that, and with a President who would be supportive of the sort of policies you'd later see under President's like TR and put them into action, which is very possible (or at least plausible) should Garfield have survived. The Progressive movement may take some time after that, but Garfield can take political action which would be "Proto Progressivist".I'm merely pointing out that the progressive movement was a complex result of a myriad of factors unique to the situation in which it arose. You can't simply jump-start something like that by changing one politician.
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