How Do We Know How Many Undocumented Immigrants There Are?

In an article Wednesday, I wrote that despite the unfolding “unaccompanied minors” crisis on the Mexican border, the total population of undocumented immigrants has been more or less flat in recent years. That led several readers to ask: How do we know that? It’s a reasonable question. For obvious reasons, there’s no official count of undocumented … Continue reading How Do We Know How Many Undocumented Immigrants There Are?