This should go without saying, except that the age of Trump is also the age in which restatements of the obvious have become necessary for civilization. Also obvious is that immigrants don’t steal jobs. They fill jobs Americans won’t do or create those that haven’t been invented. They don’t bring crime to cities. They drive out crime by starting businesses and families in shrinking cities or underserved neighborhoods. They don’t undermine American culture. They feed, enrich and reinvent it, not least through their educational ambitions for themselves and their children.

This is true of most immigrants, but perhaps more so of the so-called “holers.” As Michelle Mittelstadt of the Migration Policy Institute notes, sub-Saharan Africans have “among the highest college-completion rates of any immigrant group.” As for Haitians, MPI found they had a higher labor participation rate than the overall work force, and had median household incomes of $47,200 — lower than the overall U.S. median, but robust by any developed nation standard.

How can this be? It shouldn’t be a mystery. Immigrants self-select.