When talking about the national debt and deficit spending, I always encourage people to look into the Modern Monetary Theory.
“The key insight of MMT is that monetarily sovereign government is the monopoly supplier of its currency and can issue currency of any denomination in physical or non-physical forms. As such the government has an unlimited capacity to pay for the things it wishes to purchase and to fulfill promised future payments, and has an unlimited ability to provide funds to the other sectors. Thus, insolvency and bankruptcy of this government is not possible. It can always pay.”
And there is no bigger, more powerful sovereign government capable of supplying its own currency than the United States.