Ooookay....
First of all, manufacturing is nowhere near dead in the US. Manufacturing OUTPUT, as I keep telling people, is at record highs. A partial chart:
What has happened is that manufacturing EMPLOYMENT has shrank, to around 10% of the US labor force:
This is because manufacturing productivity went through the roof (though lately it has flattened out):
And yes, some of us know about onshoring. The problem is that when companies bring manufacturing jobs back to the US, they heavily automate the process, meaning they need a fraction of the employees they needed 10 or 15 years ago.
Even your own link discusses this:
"In the old days, a mill like this would have needed 4,000 workers. Here it takes only 650 to churn out more than 3 million tons of steel a year."
The Golden Triangle also highlights some other aspects. You need to find cheap US labor, from a population that is borderline desperate; areas that hate unions; at-will states, so they can fire people at the drop of a hat; state governments that are willing to give generous tax breaks; local politicians whose palms are easy to grease.
Keep in mind we're not talking about workers earning $25/hour, with a pension, and protections from getting fired. This is more like $15/hour for manufacturing work -- e.g. the median household wage in Lowndes County, center of the Golden Triangle, is $36,000/yr (which is far below the US median of $55,000/yr).
And even then, labor in Mexico or China can be 50-75% cheaper.
So yes, some jobs will onshore. But it's not going to turn the clock back to 1962. Not by a long shot.