this is indeed a good question as it depends from WHERE the money comes.
Japan is a very good example for that as nobody would ever assume that a country can have 236 % dept to GDP and still exist.
In japan, however, the case is different.
1. national debt in % of GDP has been declining since 2013 (in 2013 the ratio was still 243%).
2. the debt japan have is owed to around 20% to foreign nations and investors 80% of this credits cam FROM inside japan.
so even if japan would crash the most money what would get lost is their own money.
now compare that to the US. 19,5 trillion of the 22 trillion of US debt is owed to foreign countries or investors.
in compare to japan, where the debt is on the way down, the US broke all records under the trump administration. he lend money from outside (mainly from China) to fire up an already WORKING economy and produced even more interest burdon for the US household. in the same time he LOWERED the tax and reduced the government income that have now to pay with this lower income a higher ammount of interest.
one of trumps big plans have been to REDUCE US dept within a few years to zero.
all he have completed yet is that he increased this debt like not one president before him.
not in cash and not even in % there was ever a president with such a negative balance.
what he thought is a 100 years old theory that have never worked before (and it was tried a huge number of times). he thought that he can blow up the economy with borrowed money and this "wealthy effect" will continue.
this is not the case as we see. us economy is cooling down rapidly.
just look at one of the most (if not THE most) important indicators the
REDBOOK INDEX. here you see how his childish cardhouse is falling.
here you can already see very well the effect that every normally educated human could have READ BEFORE if he had simply informed himself about the stupidity.
because just like trumpīs results now look, you can already calculate that in advance in the refutation of the so-called laffer theory.
already reagan had to learn that - only he learned faster - which nevertheless secured him a place as an economist donkey in the universities of economics, because there the laffer curve is called "Reagonomics" today.
So Trump doesn't even have a chance to put his name on his economic freak because Reagan occupied the place decades ago.