Having been an owner of three different businesses in the last 40+ years I can tell you there has been a shift in the work ethic of young Americans. There may be a surplus of workers, but there are jobs Americans will not do no matter what your opinion is.
For example: I live in the CA desert. I challenge anyone to find an American who will do landscape labor in 113 degree heat, as it is expected to be today. The landscape company owner might do some, but I am talking labor. I can list countless jobs you will be unlikely to find an American-born citizen to do.
This analysis tests the often-made argument that immigrants do only jobs Americans don't want. If the argument is correct, there should be occupations comprised entirely or almost entirely of immigrants (legal and illegal). But Census Bureau data collected from 2009 to 2011, which allows for detailed analysis of all 472 separate occupations, shows that there were only a handful of majority-immigrant occupations. Thus, there really are no jobs that Americans won't do. Further, we estimated the share of occupations that are comprised of illegal immigrants, and found that there are no occupations in which the majority of workers are illegally in the country.
Of the 472 civilian occupations, only six are majority immigrant (legal and illegal). These six occupations account for 1 percent of the total U.S. workforce. Moreover, native-born Americans still comprise 46 percent of workers even in these occupations.
Many jobs often thought to be overwhelmingly immigrant (legal and illegal) are in fact majority native-born:
Maids and housekeepers: 51 percent native-born
Taxi drivers and chauffeurs: 58 percent native-born
Butchers and meat processors: 63 percent native-born
Grounds maintenance workers: 64 percent native-born
Construction laborers: 66 percent native-born
Porters, bellhops, and concierges: 72 percent native-born
Janitors: 73 percent native-born
Natives tend to have high unemployment in high-immigrant occupations, averaging 14 percent during the 2009-2011 period, compared to 8 percent in the rest of the labor market. There were a total of 2.6 million unemployed native-born Americans in high-immigrant occupations.
Some may think that native-born workers in high-immigrant occupations are mostly older, with few young natives willing to do such work. But 34 percent of natives in these occupations are age 30 or younger, compared to 27 percent of natives in the rest of labor force.