the bottom line is that America is bankrupt
America quite literally cannot go bankrupt.
You can. Poland can. France can. Germany can.
America can't. Neither can Japan (200% of GDP in debt). Not Switzerland either.
I think you know why France and Germany can go bankrupt - because they do not control their own currency. These two borrow in Euros, but only the ECB can print more Euros - not France or Germany. So... in theory, if the ECB refuses to support them, then France and Germany can go bankrupt.
But why can Poland go bankrupt? Doesn't it have the Zloty? Hmmm...
First problem: the zloty is not a global reserve currency. There is practically no demand for it, and anyone that wants to pay Poland for something pays in Euro.
Second problem: a huge chunk of Polish debt is denominated in foreign currency, because - surprise surprise - not very many people want to own zloty bonds.
This means that Polish debt in dollars, euros, and Swiss francs cannot be paid simply by printing more zlotys.
If the zloty falls sharply, the real burden of servicing euro/dollar debts explodes, and this is what causes emerging-market sovereign defaults. Look at Argentina and Turkey to understand why these things can be problematic.
America and Japan meanwhile can always create more money to meet their obligations (the cost is inflation/devaluation, not bankruptcy). This is because they owe people only in dollars and yen.