“Canada would then have to put the customs border between itself and the U.S. and apply EU tariffs and regulations on imports from the U.S. … It would be incredibly economically destructive. It would outweigh any benefits that it might expect to get from the [EU] membership over many, many years,”

With what Trump’s been doing with the tariffs, the above statement may not be true for much longer. It may well be cheaper to ship to Rotterdam than to Rochester.