As a reinforced concrete special inspector and registered Geologist I can tell you now that some of the best concrete crews I’ve worked with are full of legal [hopefully] Mexicans that put epic “Americans from the 40’s and 50’s” levels of work into a pour.
Of late, a good portion of these jobs has been on prevailing wage Federal funding projects so I’m pretty sure all of the crews are legit because of all the ID and certified payroll requirements. The conclusion I take from this is that there are very few 16-30 year old white or black males that are willing to bust ass for 10-12 hours a day for $20-30+/hour, at least in the SF Bay Area.
They all want to be rappers or Bassetball playas........................