>Manufacturing dominance was for WW2, but post WW2 it's really high tech and Silicon Valley that gave us dominance.

There was a good 40+yr there, more in some industries.

Selling the industrial economy piecemeal to china under the guise of environmentalism, worker protection, etc, etc for pennies on the long term dollar was an intentional policy choice and a resounding failure. The winners from that of course don't want to see it framed that way.