i can't say this for certain, but i'd have to think we've got some forms of agreement going on with occupied places that prevent us from just packing up and leaving. not to mention we use these places as a way to extend our military influence and response time in other regions of the world (leaving would then, therefore, be much more difficult). simply saying "let's leave" without thinking about the consequences isn't that great of an idea, although i think weaning ourselves off of foreign entanglements would be an alright idea (refusing to get involved in any future places, and finishing up where we are now).
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