The Canada thing is a good point, I always forget how much of our imports come from our peaceful neighbors.

America continues to import KSA oil mostly because California won’t frack, which could be changed if necessary.

As far as continuing to import, I believe that’s a factor of oil and refinery quality. America has some amazing refineries capable of eating garbage quality oil, including diluted tar. Since fracking produces high quality oil, my suspicion is that it’s cheaper to export that to older refineries, and import lower quality crude to refine domestically. But I’m no expert here.

The article about why Canada imports oil is interesting. Some of the Maritimes are cut off from pipelines, and aren't set up to refine bitumen. It's actually just cheaper to buy KSA oil than solve these problems. I wonder if this is true in the US since I was under the impression West Texas Intermediate was pretty comparable to Arab Light. I'd love to learn more about the specifics here.

IIRC many American refineries were retooled at great cost to eat both Canadian and South American oil, which is lower quality than the Arab stuff; nobody expected that fracking would suddenly produce a glut of really high quality oil.

Also, good quality oil can be used to dilute thicker oils to the point where refineries can process them. It’s my understanding that this is how you process Venezuelan oil for example. It wouldn’t surprise me to find out that American oil is being exported to blend other stuff before refining.