When I talk to people who actually run factories here, they say that manufacturing in the U.S. is fine. It's just highly, highly automated. You'll have a production line that takes in plastic and chips and solder, and spits out consumer electronics at the end, and there are maybe a couple dozen employees in the whole plant whose job is to babysit the line and fix any machine that goes awry. Their description is backed up by data: manufacturing output has been flat since roughly 2000 [1], but manufacturing employment has dropped by more than 50% [2].
The public discourse about why we want to bring manufacturing back to the U.S. has been split into two main points (and you'll see it in comments here):
1) We should bring back manufacturing jobs so that we can have good, middle-class wages for the large segment of the population that's currently in low-wage service jobs and about to be displaced by AI.
2) We should bring back manufactured goods so that if we go to war with China, we can still make all the things we need to wage that war.
If it's #2, that's fair enough, and every indicator is that we can do that, it'll just take time and capital and perhaps some entrepreneurship. But it won't fix #1. Just like all other manufacturing in America today, the lines will be highly automated and largely run by themself. And that's a good thing - if we go to war, we want highly productive, distributed factories because we'll need the people to actually fight the war itself. The jobs are not coming back. If you expect someone with a high-school degree to be able to own a home today, the solution is not to put them to work in a factory ("manufacturing engineer" is a skilled job today anyway, not unlike a computer programmer), but to automate building houses and get rid of zoning/permitting constraints so that there are actually enough houses for everybody.
Is this just a case where politicians tell voters what they want to hear so they can go do what they want to do anyway? "We're going to bring back good high-paying manufacturing jobs for everyone" is a lot more palatable message than "We're going to go to war so you can die."
The dip in number of manufacturing employees corresponds time-wise to China joining WTO, and the massive CEO hype of shutting down US factories and moving them to China, rather than super-duper automation hitting the scene and automating the factories in place.
I have a suspicion that the displayed manufacturing output chart is in dollars, not amount of stuff, and that is likely bumped up by highly automated IC/chip manufacturing that is high cost/value, but low tonnage work.
If you look at the participation rate of people aged 25-54 it's near all time highs.
https://fred.stlouisfed.org/series/LNS11300060
https://fred.stlouisfed.org/series/LNS11324230