I don't think Canada, as a whole, is the issue. It's the woke, DEI, ****/transgender construct that progressive leftists, be they Canadian or American, infect societies with.
I think when Trump talks about 'taking over Canada', and the likes, he's sending more of a transformative message rather than an actual threat.
Thousands of Chinese CCP agents are coming into North America via Canada and Mexico. They're enrolled in a lot of our technical collegiate institutions.
If you care to research, you'll also find that they've got a stranglehold on our infrastructure and power grid.
Marxist Communism is a dire antithesis to democracy. They cannot coexist. And Xi Jinping knows this, as does the authoritarian Putin. China's playing the long game, networking, acting friendly, but the day is coming when they'll show their fangs and usher in absolute aggression.
A little intelligent research will validate what China's got in process.
And the US military is NOT dominant anymore....in fact, we're declining at a fair rate in the global economic and strategic spectrums.