The $90 trillion millstone: We did it to ourselves.
We are now in the future we tapped in the past for the prosperity of "debt draws forward prosperity", and there's little here to be found.
From 1946 to 2008 when we hit the debt growth iceberg, real GDP grew at a compound annual rate of 3.324%. Since then it has fallen 49%, to 1.68%.
We should have stayed with capitalism in the post-war, where one risks actual savings instead of future notional tax, income, and fiat money "revenues". But capitalism went out the window a long time ago, bringing with it the end of the gold standard, the creation of the Fed, and the introduction of the income tax, among other horribles.
Payback is a bitch, and what can't be paid back won't. The rest comes out of your hide.