How long will the debt-ridden US economy last before it melts down?

The US is debt-ridden, so are her people. Yet the rubust American economy contradict all economic inductions. I believe it's because most of the other nations invest their foreign exchange surplus in US treasury bonds.

1. Is the US economy embarking on a dangerous road?

2. Is it justified to say that a melt-down is inevitable?

3. What would the most likely factors to trigger a melt-down?

4. Would the US use its unmatched military strength to forcefully cancel out her debts if a melt-down did happen?

I'll respond after a mod comes along and moves this .

longer than than the bloated chinese economy?? ;puz:
really don't know..