Diehard optimists still hoping for a forward-looking binational migration accord based on mutual respect and regional cooperation got hit with a cruel dose of reality last week. As a flood of xenophobia-tinged border security and immigrant-crackdown bills work their way through both houses of the U.S. Congress, President Bush delivered a long-awaited major speech that left no doubt about how Mexico's neighbor and trading partner will deal with reform. The message comes down to this: The United States will not regularize the millions of undocumented immigrants working in its territory. It will instead seek more efficient ways to find them,...