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If you're under the impression we are highly dependent on foreign producers for petroleum energy, you are mistaken. The import numbers are skewed by the fact that we directly import a lot of heavy sour stuff from canada, mexico, venezuela, etc. because we're one of the few nations that can refine it. In turn, we export a big chunk of light sweet, as it's much easier to refine elsewhere. In a pinch, refineries can switch to processing light sweet pretty easily. It's much easier than going the other way. We'd have a short-term moderate capacity shortfall but more than enough to run most of society, especially manufacturing and defense.