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True, but the overall world price for oil results from the last few thousand barrels pumped 'at the margin' as economists call it. So no matter where our oil comes from, the price is set by the total world production over and above consumption. If the Saudis or whoever pump a few thousand barrels more than is needed at that time, the marginal price will drop, dragging down the value of all world production. That is why OPEC was such a force to be reckoned with for so long, they controlled that last little bit of surplus production, helping to boost prices above what they would have been otherwise. So even if our oil is from Mexico, what happens in the middle east will affect the world price.