
That would also make it a lot harder for the Canadian government to track whether pro-American annexationists are amassing guns. We can’t assume everyone who wants a gun is a Canadian patriot, especially if the US ramps up hybrid warfare techniques to stir up unrest here.
I don’t know why everyone assumes the use of military force to annex Canada would take the form of a massive conventional invasion. Hybrid warfare approaches like spreading misinformation, covert ops, stirring up local pro-American militias, etc. could do 95% of the work, without the sort of overt violence that generates insurgencies.
It’s very possible to defend against hybrid threats, but only if we recognize the threat exists instead of assuming a US invasion would necessarily be a catastrophic strategic blunder.