WASHINGTON - Immigration issues are always ripe for demagoguery, particularly in an election year. But the solution to the very real problems along the U.S.-Mexican border can be found, ironically, in that other part of the world that demagogues love to ridicule: old Europe. Two years ago, the European Union admitted 10 new members. Like Mexico, all of these nations were poor, some of them fairly backward and most recently ravaged by war and dictatorship. The leaders of the European Union wisely created policies for fostering regional economic and political integration that make the North American Free Trade Agreement "look...