To piggy back on this, as a thought experiment, if you took all the wealth of every American billionaire combined you would pay for the US government for about a year.
Seizing all of it and putting it into even a foreign owned asset basket (could pick an economy as shielded as possible from US in case it causes instability in US economy) should yield enough interest (at least 5% real) to operate the federal government and public entitlements indefinitely based on present real revenues.