Most Arizona has a busy season and a slow summer season for restaurants, golf courses, supermarkets, resorts......so some companies will hire temp workers during busy season, most of whom are illegal immigrants laundered through temp agencies who never become actual employees of the company they are working for. But jobs like meat cutting and sales go more and more to Mexicans, because there is no training or advertising and Mexicans like to hire family and friends. Hire illegal as a temp, then the other Mexicans train him to be a meat cutter, then he can eventually get hired as a meat cutter and not be illegal anymore. Americans would do these jobs, but never hear about them. Even back in the 1980s, some companies hired mostly foreign nationals instead of blacks for over $15 per hour manufacturing jobs, and people complained and even signed petitions about it. It made no sense except to stop unionization
This was some years ago. I had the opportunity to play golf at a nice Chicago area country club. The caddy volunteered he and his wife split time between Arizona and the Chicago area. He had parents in the Chicago area and the wife had parents in Arizona. He did the golf caddy thing while the wife worked in restaurants while the grand parents helped watched the children.