The events of 9/11 turned North American politics upside down. US policy makers focused less on how they could better integrate the economies of Mexico, Canada, and the United States and more on security and sovereignty. Security experts have tended to view the developments that followed within a bilateral framework, but Game Changer broadens the canvas by examining how America’s desire to keep its two borders closed to threats but open to trade has influenced both Canada and Mexico. By adopting a truly North American, or trilateral, framework, this authoritative volume suggests new approaches to security in the post-9/11 world.