I didn’t know Canada produced Mexican pottery, lava rock, avacadoes, coffee and cane sugar and raised agave cactus for tequila. There are a lot of pre-NAFTA “hecho en Mexico” items. One of the biggest cross border commodities is beer.
On the other hand, if the mill was in the interior, they would have to load the steel on arail car, ship it to the port, transload it to a ship, take it to Canada, unload it off the ship and onto a railcar, then transport it to destination. It might be easier to go all steel wheel.
The Mexican cars that I saw in those long-ago days were not commonly seen here, and over those years, there might have been only 2 or 3. It just boggled my mind to have seen them here.
As for American cars, had that been in the time of digital cameras, I have little doubt that there’d be any American roadname missing from the collection that I would have had.