Concrete, drywall, framing, painting, oilfield, roofing, masonry, industrial cleaning, manufacturing, agriculture and the list goes on and on and on. All used to be viable sources of income before the flood of cheap labor. Going back to school isn't an option for most people, college isnt much more than a racket nowdaws anyway. Most college graduates I know bartend or wait tables. Not exactly a fair trade for a $30,000 degree. Why do you feel legal citizens should be forced to pay for Cracker Jack college degrees in order to compete with non citizens who dont go to college?