The United States owns its own central bank and printing press. The only way it would ever default is if it chose to do so. The central bank can buy up however many bonds it wants with new money, and the mint can do creative tricks to create as much of its own money as it wants.
I’ll add that Section 4 of the 14th amendment of the US Constitution makes it unconstitutional for the US government to default on its debt. However, the US government is currently printing money at prodigious rates; the possibility that the dollar may not hold its value is a realistic concern. Naturally this would impact the value of dollar-denominated bonds.
The United States owns its own central bank and printing press. The only way it would ever default is if it chose to do so. The central bank can buy up however many bonds it wants with new money, and the mint can do creative tricks to create as much of its own money as it wants.
I’ll add that Section 4 of the 14th amendment of the US Constitution makes it unconstitutional for the US government to default on its debt. However, the US government is currently printing money at prodigious rates; the possibility that the dollar may not hold its value is a realistic concern. Naturally this would impact the value of dollar-denominated bonds.