The radio host asked, "Which is a greater national security threat to the United States, the insecurity of America's southern border or Iran's nuclear ambition?" It wasn't a trick question. True, Iran poses an international apocalyptic sort of threat; one JINSA takes most seriously. But at the end of the diplomatic day, we - and even our reticent allies - will know what to do with a country threatening us with nuclear weapons. Mexico, our friend and neighbor, poses a different kind of problem. Mexico has been roiled by strikes and protests since July, when Andres Manuel Lopez Obrador claimed...