TUCSON, Ariz–Finishing my visit to the border back at Nogales, Ariz., the busiest port of entry in the state, it is easy to see the biggest future enemy to border security—growth. The biggest problem in Nogales is that the cities on both side and cross-border trade exploded at the same time. The border crossing site is in the center of the town, hemmed in by the city on all sides with no room to expand. All the attention on border security has ignored one of the most important requirements for …
