When it came into force on January 1, 1994, the North American Free Trade Agreement (NAFTA) joined the economic futures of Canada, Mexico, and the United States. Clearly both Canada and Mexico—reflecting the forces of geography and markets—had been integrating with the US well before NAFTA took effect. Indeed, the US and Canada had signed a bilateral free trade accord some six years earlier. But, with NAFTA in place, the pace of integration accelerated, and systematic rules governing trade and investment along with dispute resolution mechanisms were established, and the governments assumed an active role in guiding, promoting, and managing...