As the military stands at this moment. No support from any other country, and no nukes.
NO NUKES.
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#Offtopic
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Edited by Mereel N7: 7/21/2013 5:11:31 PMUS can only lose if there is a surprise invasion in this scenario. But because the only logical place to launch from is Cuba and a military buildup probably wouldn't be to hard to miss I don't see how that's possible. China's economy would probably collapse in this scenario as well because of their dependence on the US at the moment.