The "myth" claimed by the OP was that manufacturers have left the US. That is not a myth despite the US remaining a top manufacturing country - because, as you say, what remained specialized, high-value items (planes, chemicals).
A large number of particular manufacturers left the US.
The "myth" claimed by the OP was that manufacturers have left the US. That is not a myth despite the US remaining a top manufacturing country - because, as you say, what remained specialized, high-value items (planes, chemicals).
A large number of particular manufacturers left the US.