The United States and Canada are far more integrated than most people think. In fact, a merger between the two countries isn’t just desirable—it’s inevitable. We share more than just the world’s longest border. We share the same values, lifestyles and aspirations. Our societies and economies are becoming similar in significant ways.

Governors Jan Brewer (Ariz.) and Brian Sandoval (Nev.) met at the Hoover Dam March 21 to unveil signs that promote the future route of the Interstate 11 (I-11). A project Governor Brewer has enthusiastically championed to better connect Arizona to national and international trade partners, I-11 will serve as the main corridor for commerce and transportation between Mexico, Phoenix and Las Vegas.

President Obama arrived in this industrial city today to talk trade with his North American counterparts, reflecting a shift in focus from security, which dominated the agendas of past "Three Amigos" summits. Obama met with Mexican President Enrique Peña Nieto and Canadian Prime Minister Stephen Harper to discuss commerce, immigration, energy and security.