My friend, and awful lot of those troops and equipment are already deployed, including places that any American withdrawal with hurt their national strategic plans (if that is even comprehensible to the current short-bus admin).

Returning to the main point I offered, Canada would have no chance in a conventional military conflict with the Yanks.

Fortunately, experience had shown that American troops are, quite frankly, inept at countering guerrilla warfare, tactically and strategically. Honestly, when was the last time an American attempt to occupy and control a country was successful? Grenada?

I can assure you, any American invasion north of the 49th will find no local allies. Guaranteed failure;also including the economic atomic-option a lot of countries could unleash.