If we were to annex Canada we would get 10 new states...

[haele]

20. Him and what Army?

Literally and Figuratively.
Canada is a major ally and trusted neighbor, as well as a business partner.
If there's no legitimate reason other than vanity, pique, or whim, I'm pretty sure ordering the invasion and take-over of an allied nation without a declaration of War is something the Pentagon might just consider an unlawful order.
And frankly, unless there's an Amendment to the Canadian Constitution, invasion and conquest would be the only way other than, maybe a "USACorp" takeover of the Canadian Government.

And that ain't happening without a lot of rather obvious groundwork being laid in Parliament for a couple decades, which from what I can see is slowly trying to be pushed through Social Media.
Their Ronald Reagan hasn't been elected PM to start the dismantling of their social structure yet. That's when it might begin.

Just my opinion.

Haele