I don't know what it's like in the U.S. but immigrants in the U.K. do the jobs the citizens won't do.
“My own interest developed because I thought it was a fascinating subject and something I wanted to pursue.”
“Though actually the work of man's hands - or, more properly speaking, the work of his travelling feet, - roads have long since come to seem so much a part of Nature that we have grown to think of them as a feature of the landscape no less natural than rocks and trees.”