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 and scholars tend to view the developments that followed 9/11 within a bilateral framework. Game Changer broadens the canvas by examining how Washington’s desire to keep its two borders closed to threats but open to trade has influenced life in Canada and Mexico and relations among the three countries. Experts from across North America draw on international relations theory to examine and explain not only developments in key security areas such as border control and the military-industrial sector but also how policy makers can reconcile the need for greater regional cooperation when it comes to security with the desire to maintain national autonomy in other areas of life. By adopting a truly North American, or trilateral, framework, this challenging and authoritative volume suggests new approaches to security in the post-9/11 world.