To add unto Turnbull's last sentence, FDR probably saved America from going Communist. With the old traditional political government philosophy (i.e. "capitalism solves everything") so discredited by 1932, if FDR or any Democratic national candidate that year had simply continued the status quo with useless symbolic token changes...well this was back in the days when ultra-left presidential candidates scored ridiculously high. (Both the Socialist and Communist Party candidates together in '32 polled nearly a million votes)

If shit continued to be quite bad, who's to say the ultra-left doesn't become more attractive to a very desperate jobless electorate who worse have no faith in either party to solve this Depression? To simplify and bolderdash a complicated political story, that's what happened in Germany that same decade, the Weimar Republic being pulled apart by the political extremes (the ultra-right Nazis and ultra-left Communists.) One won, and obliterated (literally) the other.

Instead FDR ushered in a watered down, more Wall Street*/Main Street friendly form of socialism, and pretty much castrated the hope of the Communists/Socialists forever more from being a potent political force in America.

*=Yet many elements were so enraged and frightened by the New Deal, they (allegedly) conspired the Business Plot where they would militarily overthrow FDR and install a puppet executive. One of the alleged members was Prescott Bush, a father (and grandfather) of future U.S. Presidents.