If you glanced toward America's neighbor to the north, you might see tension so thick you could cut it with a knife. Canada isn't thrilled with U.S. trade policy. And U.S. President Donald Trump isn't happy with Canada.Some in Canada are equally unhappy with Trump's former partner Elon Musk and his company Tesla (TSLA 3.13%) after its rush to file for expiring incentives raised eyebrows, but was later found to be legit. So Canada, Musk/Tesla have a rocky relationship. But Canada might end up lining Tesla's ...