Our company helped build a large addition at the Gwinnett County Jail a few years back. I saw more Mexicans there (both inmates and construction workers!) than I saw when I vacationed in Cancun.
They are just not mexican, I went down the street in Cartersville Ga, a few weeks ago, they was a private contractor working down town, one white guy and fifteen Latinos and that was a contract on a city job.