The United States' situation.?

Okay, so the last time I checked, the US was in debt about three trillion dollars($3,000,000,000,000) and about %60 of that debt was to china. I understand how the world bank works, and i'm not stupid, but it doesn't seem like their government is able to recover from this massive debt. Let's say that in about ten years(assuming the world doesn't end next year), there is some sort of worldwide crisis and China called in it's debt. Now, since the US is a member of the UN, they can't declare war, and China wouldn't declare war, as it would be a world war, but in the name of justice, would China then be given %60 of the US' land and resources, or would the debt be expunged? (Keeping in mind that there's no way that the US could afford to pay the debt)