> You seem to have a few of your own: "Canada only has to patrol its northern border"
the Canadians do not aggressively patrol the southern border because that is where all of the people are -- unlike the north -- and because the reality is that the entire Canadian military is basically a speedbump for if/when the US invaded in earnest.
Americans: X country is only a speed bump for our awesome military.
Also Americans: Have never managed to win a single war on their own while usually fighting underdeveloped tribes whose most advanced equipment is sandals, while at the same time both allies and enemies have a billion jokes on how bad they actually are.
You need a special kind of personality to be this confident while currently losing a war, one that is, well, associated with Americans.
Erm, they can stay in NATO with the other European members just fine. It's the US that is making noises about leaving. NORAD is another matter, but the US and Canada can each run their own radars - the targets are south of the 49th parallel for the most part.
America threatened both Canada and Greenland. Both NATO countries. It is engaged in murders of boatsmen, it started an illegal war that literally harmed countries around the world, it kidnapped a president just so it can blackmail is former right hand and is intentionally causing humanitarian catastrophe in Cuba to blackmail its government.
I'm genuinely curious to know what you think the author's pre-existing beliefs are.
You seem to have a few of your own: "Canada only has to patrol its northern border"