BS. Those jobs didn’t become obsolete. They just moved. I’ve seen our plants in Vietnam. They don’t build low tech. They build high tech and employ what they need to employ. Better that here than there.
Most free trade philosophy garbage is just propaganda.
A society must have jobs that can employ folks across the IQ spectrum, or else a permanent underclass results. The USA was always the economic pinnacle because of our successful middle class, which the globalists have tried to destroy.