The future of the United States lies in North America. This is not a geographic truism, but a strategic imperative. Generations of Americans, distracted by far-flung crises, have long taken our own region for granted. This must change if the 21st century is to be an American century. The United States, Canada and Mexico are bound by a shared economic, environmental, demographic and cultural destiny. How we move forward together is key to our success. In recognition of our shared destiny, the three countries should create a North American passport that would, over time, allow their citizens to travel, work,...