but the employers will find a way.

which is why i'd rather see pressure put on them to end exploitation of undocumented immigrants via low wages and other mistreatment.

if the exploitation problem is fixed and employers are no longer able to pay unfair wages and mistreat employees then i expect the employers will hire more blacks which would mean the undocumented have fewer job opportunities which will mean more of 'them' will either 'go home' or 'stay home' which will mean fewer of 'them' here which will give you what you want - fewer undocumented immigrants here and more blacks employed.