I corrected the actual misconception in another comment: CBP is not hiring noncitizens.

Given that, I don’t know what to do with the rest of this. Knowing about the racial makeup of past immigrants is apparently super important for a bad answer to a question based on faulty assumptions.

And I guess you dropped in that little parenthetical about politicians promising that law wouldn’t change white-only immigration just as a fun little reminder about how people in the 1960s were super racist.