If you owe debts to other countries you have to pay that money outside the system. So it takes a certain percentage of production (GDP) and pays the benefit of that production to people in other countries. Japan has a much bigger debt problem than the USA in percentage terms. Nearly all their debt is owed to those in Japan so when it is paid it merely redistributes wealth (rather than losing it to those overseas).
While inflation can allow you to payoff debt with less valuable $ and thus reduce the value of what is given to other countries (also to retirees and other holders of government debt but for the matter of losing wealth to other countries that isn't a factor). But markets adjust and unless you have now paid off all your debt and owe nothing you have to borrow again, and lenders will demand larger interest payments to make up for the risk of your debasing the currency to pay them back worthless dollars. So while this can maybe work in the short term if you fool the markets it most likely doesn't work in the long term for the USA.
I would say it is probably true defaulting on foreign banks would be preferable but it isn't that neat. The USA would default to everybody and it would be chaos (because of the central role of the USA - different than if some minor economic power defaults). The USA owes lots to foreigners and those in the USA and while spreading the costs of default overseas sounds better really it would be so catastrophic I doubt it matters. Debasing the currency through inflation is what would happen instead in the case of the USA. Which would have bad costs to the USA and to those holding USA government debt.
While inflation can allow you to payoff debt with less valuable $ and thus reduce the value of what is given to other countries (also to retirees and other holders of government debt but for the matter of losing wealth to other countries that isn't a factor). But markets adjust and unless you have now paid off all your debt and owe nothing you have to borrow again, and lenders will demand larger interest payments to make up for the risk of your debasing the currency to pay them back worthless dollars. So while this can maybe work in the short term if you fool the markets it most likely doesn't work in the long term for the USA.
I would say it is probably true defaulting on foreign banks would be preferable but it isn't that neat. The USA would default to everybody and it would be chaos (because of the central role of the USA - different than if some minor economic power defaults). The USA owes lots to foreigners and those in the USA and while spreading the costs of default overseas sounds better really it would be so catastrophic I doubt it matters. Debasing the currency through inflation is what would happen instead in the case of the USA. Which would have bad costs to the USA and to those holding USA government debt.