The US plans some of their invasion/regime change over the course of years if not decades.
I honestly believe that Trump was briefed on some plans to annex Greenland, Canada and Panama, and the fucking buffoon let the cat out of the bag.
I have something like 57% certainty that democrats would eventually start denouncing "fentanyl labs" in Canada and create excuses for invasion.
edit: Worth noting, by the way, that's it's a consensus that Canada is more liberal than the US. Having Canada as a 51st state would essentially be handling the Dems a huge advantage for all elections going forward... Gee golly, I wonder whether they might actually root for Don a little bit, there.