No government ever pays it’s debts. Brace yourself for monumental inflation.
At most 10%
The only reason being world markets render instant judgments these days. It's not like the 1930's with Germany
And a country like Zimbabwe is off the economic grid so does nor count. Modern industrial nations have too many interconnecting financial markets for the Fed or any USG entity to get away with inflation over 10% and the threshold is probably more like 6%