A second part of the equation is that paying someone $4/hr is illegal, so the employers who are willing to pay at that rate will usually not consider hiring a U

A second part of the equation is that paying someone $4/hr is illegal, so the employers who are willing to pay at that rate will usually not consider hiring a US citizen for fear of a lawsuit somewhere down the line. Your argument does not explain the discrepancy between the unemployment rate for white people 15-24 and black people in the same age range, unless you are implying that the young white person will take the job at the same pay rate as an illegal worker would. PS: If you work at Walmart $8/her is par for the course