You mean Americans go to school for 4 years only to have someone from a foreign country probably with little training come over here and snatch up their job. This hardly sounds like a job Americans won't do.(sarcasm).
Also, look next time at who is building your highway. I have yet to see a black or white face.
People have been brainwashed about sending their kids to college and not trade schools. Last time I heard, my plumber was making pretty well $$$$$