[FrankenPC]

>They're also guaranteed by the federal government, which has seemingly infinite resources.

IMO That resource is GDP. If American's can't find meaningful work that has financial value not just domestically, but internationally, we'll see how much of that resource is left after a few decades. Or more accurately, we'll see a VERY tiny percentage of Americans with vast wealth and the majority struggling for subsistence because the government has essentially been deactivated due to lack of funds.

[chillwaves]

If America runs out of money, they will just print more. If their creditors call out their loans, America is very happy to pay them off: in US dollars.

[FrankenPC]

At some point China will stop believing in the value of US bonds.