Given that existing pipelines are already overcommitted or at capacity and carry not much more than a tenth, and given that America is mostly the only option for refining the heavy sour tarry crap they pull out of the athabasca sands, this doesn't matter much. This is what came up during trump's threats about tariffing oil. They basically would have had to eat the cost unlike most of the other tariffs trump has proposed.

Regardless, let's say two places have very different values and ideas about how they want to live and what goals to pursue. What the hell gives one place the right, particularly when it consistently votes down the desired values of the other, to prevent it from leaving and going its own way? Self-determination as a principle isn't magically restricted to national borders only. That would be a ridiculous assertion.