Illegals included, is that the U.S. would be IN NO WAY better off if they left. They contribute more than they cost and are no significant part of America's crime problem, and NOBODY ever comes here for WELFARE.
https://rationalwiki.org/wiki/Myths_and_facts_about_immigration_to_the_United_States
https://rationalwiki.org/wiki/Myths_and_facts_about_immigration_to_the_United_States