One of the problems now is with robots manufacturing changed. With robots even warehousing has changed as well as farming. So you pay workers the minimum or you automate. And if moving to Mexico is an option for a business all you need to do is drive across the border, no long distance shipping and plenty of cheap labor. They just need to fix up the roads going to the existing fence or new wall.

What can take the place of manufacturing? I don't know.
What pays a middle income salary outside of the services and health industries?
It's very frustrating and depressing to think about.