My guess is that you don’t work in manufacturing and haven’t done any comparisons to see what it would cost to manufacture here vs other countries? Hint: it’s far more than a few percentage point difference. It usually means that you can no longer make a profit, because your product will have to be far more expensive than your competitors, and most people don’t care enough to “buy American” vs save a lot of money. And for some products, manufacturing here is literally just not an option at all.
It is difficult to manufacture here, but not because of labor costs. It is because we outsourced all these businesses so many simply aren't available. The few that exist don't want the odd or one-off jobs, they don't have the equipment just sitting around unused or the trained employs sitting around waiting for work. They either got sold off decades ago, or got the business got destroyed by all the buyers chasing the pennies that outsourcing temporarily offered in the past.
Very few place are still holding onto older equipment because the places still operating cleared the floor space for higher speed higher volume equipment to try and maintain contracts with big purchasers that did or were threatening to leave to get that cheap unregulated foreign production. Turns out that didn't last forever, China isn't letting companies freely pollute anymore nor are they dumping subsidy money into manufacturing businesses to buy new equipment, but they still have all the equipment running, while much of the US equipment was either sold off or sat decaying and unused for decades.
Even if you could prove starting up a US manufacturing business to satisfy these demands was profitable, who is going to put up the investment money? There is no way such a business is going to be able to promise the same kind of returns as investing into tech companies, financial companies, or the overall stock market, and so they continue to mostly not exist. People with the capital to change things are seeking the greatest profit, not mediocre profits, and manufacturing in the US is mediocre profits for all but a few specialized industries.
TL;DR New US manufacturing production and capabilities lacks capital investment because profit margins are not super high and there is basically zero chance of an investment windfall.
