I hear the nonsense reasoning from the Trump crowd, but many know it's nonsense even as they say it. What is their real goal here?
But that also makes no real sense. So I don't know.
(They neglect that what made it the dominant manufacturing power was a war that killed tens of millions and sidelined most other industrial nations, but perhaps that's plan B when this doesn't work)
As for using tarriffs to deliver the factories, they assume the US market is so vast and desirable, that it's worth building plants and full supply chains specifically for it. I'd expect that any firm that believed that had onshored their factories years ago due to plain economics, without a comical tarriff regime to spur it. (I'm thinking of how "foreign" automakers sprinkled plants all over the South making models that largely fit US preferences)
Conversely, I suspect you'll see a lot of firms say "we'll just skip the US entirely" -- the factory you built in Viet Nam or Germany can still sell cheaply to a hundred and fifty countries, and together that adds up to more than even the US can offer.