As for businesses, they do open them under the names of legal friends or relatives. They are self supporting and taking nothing from our Gov or Americans so who cares? I sure don't as long as they support themselves. Our Gov could speed the process to get them here legally instead of them dying of old age waiting their turn. I can understand their desperation, why can't our Gov?
Here they take the jobs the teenagers and other Americans wont do such as stocking shelves at night, cleaning Hotel and motel rooms, stoop labor on farms, crappy jobs at Walmart, K-Mart and other such businesses, working for Lawn Care and other gardening services, car and truck wash places, kitchen help, working for office and Hosp cleaning services etc. Why aren't Americans applying for those jobs? Would you, your friends or your daughters want those jobs? Teen either don't want those jobs either or these places will not hire them.
The Chinese place I keep mentioning here has been desperate for "help" for weeks as is the crane operator place and there aren't even enough illegals here now to take those jobs.
BTW, there are many places that will hire Mexicans and the retired rather than teens because the teens are not reliable. They have too much trouble with them.