evidence: The data about migration, and about what crosses the U.S.-Mexico border illicitly, point to problems at the border. But they’re not the problems that the president is talking about. Instead, they point to a need to adapt our asylum system to a very different profile of U.S.-bound migration, and to build up our official border crossings—our ports of entry—instead of our walls and barriers. [...] It is very unusual to find migrants at the U.S.-Mexico or Mexico-Guatemala borders who are from "special interest" countries like the "Middle Easterners" that President Trump, offering no proof, speculated were embedded in the Honduran "migrant caravan." [...] Large-scale child and family migration, from Central America and perhaps from elsewhere, is going to be a constant in the unstable world of the 2010s and 2020s. Instead of raging against it, we must start adapting to it. Much of the solution to all of this lies in two neglected U.S. institutions: the immigration courts and the border ports of entry.