For entry-level positions in New York City: Circa 1940, the workforce was 66 percent black native workers, 6 percent Hispanic foreign-born, and 2 percent Asian foreign-born. But by 1990, those numbers had significantly shifted, with the black native-born population comprising only 30 percent of the workforce, compared with Hispanic foreign-born at 20 percent and Asian foreign-born at 15 percent.

Cited by Amy Wax, Low skilled immigration: the case for restriction, American Affairs, Winter 2017.