U.S. business has always depended heavily on cheap foreign labor. Without both slave labor and European immigrant workers, the U.S. could not have become the wealthy industrialized leader of the early 19th century. The railroads were built largely by Chinese immigrants, and large-scale agricultural production still depends on Mexican workers. Anti-immigrant policies are based on prejudice and misinformation. Immigrants are not the drain on the social budget that they're made out to be.
Immigrants are more likely to be self-employed and start new businesses.
They pay more in taxes than they receive in educational and social services. In spite of high poverty rates among immigrants, they use fewer public benefits than citizens and are less likely to become dependent on welfare. Undocumented immigrants are not eligible for welfare, food stamps, or most other social programs. And there have been proposals to deny even emergency health care to immigrants. This might result in anyone of foreign appearance, in other words, people of color, being delayed and interrogated in emergency rooms when minutes count.