If they change their names to Pedro or Maria and say they are from Mexico they might be able to earn a living. Or they can move to India and change their names to Indira and Raj.
While illegals have to be dealt with (and legal immigration, especially H1-B visas, have to be overhauled), the standard of living of these people is not enviable. Granted, they’ll never have to work a day in their lives with all of the freebies, but they will live in neighborhoods you wouldn’t want to be caught dead in at noon. They only come here because being poor here is better than being poor south of the border; at least here our poor people have a diabetes/obesity epidemic.