To further drive home what actually happened with FDR, his policy proposals were repeatedly taken to the Supreme Court and a lot were struck down. It took the SCOTUS to realize that they would soon face a legitimacy crisis if they continued to enact the policy perspective that they wanted.

Oh, and before someone comes and brings up the court packing proposal, it didn’t have to happen, and FDR’s main claim to making the proposal was that he had a mandate based on his, iirc, at the time 3rd supermajority sweep of the electoral college, unlike, say our current President who claims a mandate while not even winning 50% of the popular vote and fell way short of even 400 electoral college votes.