Why do people prefer to employ illegals rather than US citizens?

illegals ( mexicans in other words ). man they take pride in there work they'll b the first ones on the job and the last to leave. if it wasnt for them you wouldnt have a house, apt to live in. and ur gr would never be cut. if it were'nt for them we wouldnt have mexican food and that **** is gooooood. texas that is.