bankruptcy or WW-III?

Forbes | "at all levels, federal, state, local and GSEs, the total public debt is now at 141% of GDP. That puts the United States in some elite company--only Japan, Lebanon and Zimbabwe are higher. That's only the start. Add household debt (highest in the world at 99% of GDP) and corporate debt (highest in the world at 317% of GDP, not even counting off-balance-sheet swaps and derivatives) and our total debt is 557% of GDP. Less than three years ago our total indebtedness crossed 500% of GDP for the first time."

Add the unfunded portion of entitlement programs and we're at 840% of GDP.

The world has not seen such debt levels in modern history. This debt is not serviceable. Imagine that total debt is 557% of GDP, without considering entitlements. The interest on the debt will consume all the tax revenues of the country in the not-too-distant future. Then there will be no way out but to create more debt in order to finance the old debt.