How Canada can best respond to threats from United States

Andrew Coyne/The Globe and Mail: The collapse of talks last week shows the limits of that strategy. Even as we attempt to expand our exports to other countries, we remain primarily reliant on exports to the U.S.; and since the President views that as important leverage over us, he is unlikely to look kindly on any efforts to reduce it. Hence the urgent efforts to prevent us from pursuing an independent trade policy: leverage in the service of leverage…