(1) over-population is a problem, (2) competition for scarce resources, (3) many immigrants, legal and illegal, belong to “protected” groups in the US and therefore receive preferences for jobs, college admissions and more, (4) citizens are penalized again when their taxes go to support the very people receiving the benefits and preferences
First a citizen could lose a job or a seat in college and THEN be forced to pay for the winner through taxes.
Unless all of these issues are rationalized and explained legally, economically and ethically, division is just aggravated.