Yeah, but Roosevelt didn't fix the Great Depression, WW2 did.
And before WW2, our Government was in a much better position than it is now --- which is arguably in the bind it is in, from an unholy combination of military spending (Republicans love this) and from poor Medicare/D/SS design and paying government/civil workers too much and giving many of them overly-generous retirement packages after just 20 years work (Democrats love all of this).
The USPS, after it was spun off, reformed its pension plan, and while the few billion it needs a year is loudly denounced, it largely works considering what it's mandated by congress to do and other paremeters it has to work within, plus being one of the largest employers around.
So neither side is really for the people. And why would they be? The people don't control their reelection in reality.
We need an amendment giving power back to the people, and that's by giving only citizens the right to give to politicians in their jurisdiction. No corps donations. No PAC donations. No ALCU or NRA donations. Just citizens. Senators like Biden from Delaware shouldn't have an interest in representing Hollywood. And so on. Congressman from Bumtickle, Idaho should only be able to collect money from the Bumtickle, Idaho congressional district. Senators from their state. Mayors or Mayoral candidates from their city.
That should curb influence, from say, NYC banks.