The US economy is vulnerable no matter who owns the debt. You think that if Americans owned the debt that they would not pull their money out if they could get a better deal across the border or the seas? LOL It would just be like cars or electronic gadgets or blankets, if they can get more bang for the buck somewhere else they would do it. Thats the way people here think nowdays, they have no real loyalty to America they are just out for themselves. They dont think that if this ship sinks what will they do and where will they go because they live for the moment and are delusional in thinking that their ship cant sink even if everyone elses does.