There are two or three answers to that question.
What we teach our business school students is that it's never wise to have one customer for your product, because that customer exerts power over you in a way that you don't want.
The second thing I talk about in my course is that one of the biggest myths in Canadian economic thought is that the Americans are always our friends. Sometimes they are, and sometimes they aren't. It's up to them which role they play.
We have U.S. election coming up, and it's a wild card now who will win, but to automatically assume that the U.S. will take decisions at least thinking about us is wrong. I don't think there's evidence that it does that. In fact, when we originally negotiated the Free Trade Agreement in 1989, 1990 and 1991, the Americans were interested in our energy; that's what brought them to the table. Now they're not because they have plenty of their own.