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Considering the practicalities of the matter, it would be far more expensive and *extremely* wasteful to suddenly wind everything down that's going on around the world, buying expensive air tickets to fly the overseas workers back home again, having to make big payoffs in legal costs for unkept promises and commitments and plenty of other expensive legal and moral obligation dodging in order to save some money to spend right now at home.
It would very likely take a full six months (at least) to fully withdraw from the rest of the world, at which point, losses in trade (yes, aid actually generates revenue) and public and political concerns over America's knee-jerk reactions to events would cause uncertainty, resulting in the dollar being worth even less than it is now, combined with a pulling out of investment from abroad, resulting in massive job losses, higher taxes, gas prices and eventually hyper inflation.
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