The size of US treasury bond bonds reached US $39 trillion, and the annual interest expenditure exceeded US $1 trillion

The size of the US treasury bond rose to about 39 trillion US dollars, and the annual interest expenditure reached about 1 trillion US dollars, exceeding the defense budget. The U.S. national debt system was established by Alexander Hamilton in 1790 to support the reserve currency status of the United States dollar. The Wharton Budget Model PWBM at the University of Pennsylvania shows that when the debt to GDP ratio exceeds about 210%, the fiscal system faces unsustainable risks. At present, the proportion in the United States is about 100%, and the Congressional Budget Office expects it to rise to 175% by 2056.