The Keystone XL pipeline is not what it appears to be as Canada already has access to more pipeline capacity into the US than it could possibly use, however those pipelines only go as far as refineries in the Midwest where the refined products are sold to Americans only. The goal is to get a pipeline that will go all the way to the Gulf of Mexico, bypassing the Midwest (and thus reducing the amount of refined fuels produced which will cause prices to actually rise which would be good for the companies investing in the pipeline) so that they could then sell the oil to overseas customers and NOT the US. In fact, the incentive will be to ship all of the refined products out the country since if they do they will not have have to pay any US taxes on the profits they make since the oil will technically be considered as never having been in the US (it went in one end of the pipeline in Canada and came out the other in a free-trade zone in Texas which legally means it was never actually IN the US).
http://thinkprogress.org/climate/2011/12/20/393247/fact-check-keystone-xl-would-ship-foreign-oil-to-foreign-lands/
http://www.nbcnews.com/id/46689167/#.UR_dNKWfOU4

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