"The evidence suggests that American would be better off if immigrants were more skilled. And it can be plausibly argued that a smaller number of immigrants would be beneficial for the country. But major changes in immigration policy occur only rarely. Therefore, the road ahead is long and fraught with dangers. But the adverse effects of the Second Great Migration‚ will not go away simply because some do not wish to acknowledge their existence."

-- "Heaven's Door: Immigration Policy and the American Economy," from The Milken Institute