The majority of American's wouldn't want to work in factories and feel that menial jobs with low pay are beneath them. Those who actually enjoy those jobs and work at factories typically have union support and so earn an above average wage for their position and typically are given benifits.
Employers, motivated by profit, do not wish to pay these things, and can outsource those jobs to other countries and pay people far less. They're not coming back until there is a cost advantage to them doing so.
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