Mexico’s Next Chapter

Mexico’s establishment party got kicked to the curb in Sunday’s election, winning only 16 percent of the vote, which should remind us that we are constantly told two rather contradictory things about immigration from Latin America:

—First, immigrants are pouring in from the banana republics of Central America not because Central America is (permanently) poor, but because Central America is (supposedly only temporarily) plagued by criminal violence.

—Second, there’s no need to worry about the...