The US is in debt to more countries than are in the alphabet - including China. China is currently issuing loans to the US in the vague hope they may be repaid on the due date :-)
When you consider one year ago 94% of all household assets in the US was the total debt owing to other nations and that situation has got worse in the last twelve months - I doubt this is a nation that has one hope in hell of going to war with anyone, despite all the hardware :-)