Several White House officials revealed to NBC News that President Donald Trump is growing increasingly “worried” over Canada regarding its ability to defend its borders, with one official saying that Trump’s concern stems from his “vision of ‘solidifying’ the Western Hemisphere,” the outlet reported Sunday.



That hardly recommends itself as a defensive strategy.
Actually, France had a very strong army at the time. Two points here:
So, unfortunately, a serie of terrible decisions allowed Hitler’s Germany victory: an inadapted defense, and a reluctance to attack.
Main issue for Canada as for most of European countries willing to “defend Greenland”: US made equipment and systems: either you have a strong stock of spare parts, or we won’t stand long. And that’s without counting the basic volume advantage of the US military, and that’s without counting the prevalence of US cloud based services everywhere in industry and government agencies.