Read other letters about this article
I'm from Canada and I can tell you unequivocally that Walmart has not left Canada. The story of the attempt to unionize the Walmart was a grassroots campaign by the workers (not the government) which succeeded. Instead of allowing it, Walmart shut down that store claiming it was losing money (yeah right).
I do think though that the Democratic stance of protectionism is wrong-headed. I agree unions do (at times) increase costs and businesses leave because of cheaper labour costs elsewhere. There is no happy middle ground with these conditions. There are many solutions that haven't been looked at (ever) but radical change is something the USA isn't very good at.