That's exactly what's happened here where I live, with the two poultry plants in town (honeysuckle white and tyson's) now almost exclusively hispanic. And the white and black area workers didn't quit , they were forced out by a combination of ways which included acts of violence against nonhispanic workers.
When I was in HS, you either went to college, or you went to the poultry plant-and you were very likely to wind up with better pay and benefits than would your average BA major. That changed in the early 1990s. Now all those poultry workers (who most certainly were NOT "too proud" for those jobs ; they were delighted to get hired on there) are working 2-3 walmart/mcdonalds/gasstation jobs just to (barely) survive.
May every American, including any freeper, who repeats that smug little mantra, "They just do the jobs Americans are too proud and lazy to do" burn in H-LL. And that goes triple for our politicians.