You’re right about the builders. It’s hard to find a caucasion electrician, plumber, concrete worker, framer, HVAC, sheetrocker, carpet layer, insulation installer, etc. in the entire state of Texas.
Oh, there's probably a Caucasian in there somewhere. They usually are the ones that 'front' the crews (i.e., get permits, inspections and signoffs) who have the proper licenses.