Bill,
The Great Depression soldiered on for a decade, after FDRs election, and every policy he implemented made it worse, not better. Here, that bastion of conservative thought, UCLA economics explains why:

http://newsroom.ucla.edu/releases/FDR-s-Policies-Prolonged-Depression-5409


RE debt under the tax cut: You have to fix the economy, Stupid, before you can begin to clean up the mess from the previous administration. You also forgot to note that under the budget proposed by Mr. Trump, the budget is balanced in 15 years.
Quite a triumph.

Best,
Ted