Respectfully, have you look at the inventory of those so called exports? I suggest a deeper analysis, broader inspection. Your figures are inaccurate. See: https://ustr.gov/countries-regions/americas/canada

The US holds all the keys. For example, restrictive cross border custom rules. Revisions to the tax treaty by way of more aggressive suggestive interpretations. Financial regulations and restrictive access to their capital markets of which the majority of our financial system depend on.

They can seriously choke us more we can to them. Forget about the oil thing. They have access to globs of better grades of that stuff than the public is led to believe.

I agree it would ugly fast. But we will be on the short end of the stick.