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Our excuse for killing off manufacturing in the UK was Thatcher.
What's America's excuse ?

Free trade. There are highly regarded experts from both ends of the
political spectrum who say it's necessary.

They all have jobs in the service sector and are relatively immune from
foreign competition themselves.
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This may have been true at the higher levels at one time but with
telecommuting service sector jobs are also rapidly disappearing.
For example many low to mid level accounting jobs such as tax
returns are now done overseas. Where the jobs cannot be done
externally H1B visas allow worker importation.