At least one other time, in 1973, I think, the US administration defaulted. After running up Viet Nam war debt Nixon devalued the currency by de-coupling the va

At least one other time, in 1973, I think, the US administration defaulted. After running up Viet Nam war debt Nixon devalued the currency by de-coupling the value of the dollar from the price of gold. The debt was repaid in dollars that had lost their value. There was another effective default/devaluation, but I can't remember the circumstances, sorry.