I have a vision - Canadians leverage their decades of experience with cross-border shopping for cheaper stuff in the US, to build US-focussed shopping areas close to every border crossing. Focus on particular things Americans seem to really want to be cheap, like eggs, clothes, and cars.
Then, in every parking lot, we have teams of Roving Canadians teaching them how to make it back across the border without paying tariffs or duty.
“No, you can’t use the shopping bags, that’s a dead give-away. Just pile it on the floor in the back on the car. And remember to take the tags off and dump them in the trash over there. And while you’re at it, remember that weed is also legal in Canada now!”
ETA: and cars and trucks! We’ll set up a website, you put in the make and model of your current vehicle, and when you arrive, we swap it out for a new one of the same make, and same color, just switch license plates, and boom! New car! We’ll spread mud on it to make it look old, for an extra charge, of course.