How likely is a bankruptcy of America? (Part 3)

Now the US national debt exceeds GDP. For clarity, it can be compared with the most difficult moments of history. For example, in 1948, according to the Marshall Plan, to rebuild the economies of western Europe took 12 billion USD, Or 4.3% of US GDP. Even in 2008, at the peak of the mortgage crisis, in order to divert the leading banks in the country from ruin it took 700 billion USD, or more than 5% of US GDP. It turns out that America is increasing the amount of debt as fast as if there were all financial, military, and natural disasters at the same time. In fact, nothing like this, of course, does not happen. According to the financial media, the economy returned to normal, and everything is so good that even the Fed is going to raise the key rate. In such circumstances, the country must reduce debt rather than increase its rate.
Of course, all this can not do else, but worry the creditors. USA is the leading economy in the world, and if suddenly one day, the country decides not to pay its debts, it could lead to an unprecedented crisis.