So much of the way the United States works is having a nearly limitless source of borrowing at low rates in the form of selling treasury bonds. The further we get away from that being true, the more precarious things become.
All the people complaining about "US Debt" and $26T of "net investment" or whatever don't realize that this is/was the benefit of the US being stable, strong, and friendly.
When the US is unstable, weak, and a bully, as it is now, all that goes away. The bill comes due, and the US will pay dearly. The rest of the world will pay nothing.