Imagine that a new U.S. president, different from the one we just elected, set out to maximize the number of illegal Mexican immigrants. Maybe he or she saw electoral advantage in this, or maybe just thought it was the right thing to do. But how to achieve that end? Imagine also that I was called into the Oval Office to give advice.
I would start by recommending an enormous new program of fiscal stimulus and construction. Let's rebuild our roads, bridges and power grids, and put up some new infrastructure as well, including perhaps an unfinished border wall. That will require a lot of labor, and Mexican labor, including that of the illegal variety, is common in the construction business. The financial crisis, and the resulting freeze-up in the housing market, was a major reason why Mexican migration to the United States went into reverse, so a new building program might counteract that trend.
But wait, that's not enough. When state and local governments hire people to perform labor, they insist on some pretty serious documentation of legal employment status. The federal government does the same. So the stimulus plan will have to be designed to evade such enforcement possibilities.