Given the critical amount of oil imported for domestic refining by the US, shutting off access to Canadian oil would substantially impact US refineries, which would flow to both domestic supply of refined products as well as exports and be a devastating blow to US refineries. It feels a little like mutual assured destruction in the energy sector.

A blockage would also be nearly a declaration of war against Canada. I’m sure the spineless Rs currently in the US congress would simply wring their hands (and at least one Maine Senator would voice her “concern”) but a flip in both houses might substantially change to outlook.

More importantly, there is nobody in the US Republican Party who has even half the narcissism of Trump, and of those none have even a quarter of his charisma/cult following. As absolutely trashed as the US’ reputation is internationally, the colonial expansion era of the US will die when Trump is no longer directing policy.

The article has theoretical merit, but the practical application is so remote as to weigh very little on actionable policy. (IMHO, of course)