Americans will be TERRIBLY hated, for causing the calamity. Plus, as we pull back our military, foreign governments will feel free to confiscate anything you have w/o protest from Uncle Sam. The only place I'd even consider would be Canada; freedom is pretty intact there.
The order provided by the US military is taken for granted around the world. When we pull back, a lot of the world is going to revert to its more normal state, similar to Darfur, Afghanistan, or Somalia. Far better to stay here -- gonna be bad but not as bad as those hellholes.