“Incentives to help level the playing field are a key piece,” said David Moore, chief strategy officer and senior vice president at Micron. “Building a leading-edge memory fabrication facility is a sizable investment; it’s not just a billion or two here and there. These are major decisions.”

In the aftermath of the coronavirus and restrictions on exports of goods like masks, moving manufacturing closer to home is also being viewed as a national security priority, said Rick Burke, a managing director with the consulting firm Deloitte.

“As the pandemic continues, there’s a realization that this may be the new normal,” Mr. Burke said. “The pandemic has sent a shock wave through organizations. It’s no longer a discussion about cost, but about supply-chain resiliency.”

Despite the big announcements and the billions being spent, it could take until the late 2020s before the investments yield a meaningful number of manufacturing jobs, Mr. Burke said — and even then, raw materials and some components will probably come from overseas.

Still, if the experts are correct, these moves could reverse decades of dwindling employment in American factories. A quarter of a century ago, U.S. factories employed more than 17 million people, but that number dropped to 11.5 million by 2010.

Since then, the gains have been modest, with the total manufacturing work force now at 12.5 million.

But the sector remains one of the few where the two-thirds of Americans who lack a college degree can earn a middle-class wage. In bigger cities and parts of the country where workers are unionized, factories frequently pay $20 to $25 an hour compared with $15 or less for jobs at warehouses or in restaurants and bars.

Even in the rural South, long resistant to unions, manufacturing jobs can come with a healthy salary premium. At America Knits, a private-label manufacturer that sells to retailers including J. Crew and Buck Mason, workers earn $12 to $15 an hour, compared with $7.50 to $11 in service jobs.

The hiring is being driven by strong demand for the company’s T-shirts, Mr. Hawkins said, as well as by a recognition among retailers of the effect of supply-chain problems on foreign sources of goods.

“Retailers have opened their eyes more and are bringing manufacturing back,” he said. “And with premium T-shirts selling for $30 or more, they can afford to.”

A few years ago, Julie Land said she would naturally have looked to Asia to expand production of outerwear and other goods for her Canadian company, Winnipeg Stitch Factory, and its clothing brand, Pine Falls.

Instead, the 12-year-old business is opening a plant in Port Gibson, Miss., in 2022. Fabric will be cut in Winnipeg and then shipped to Port Gibson to be sewn into garments like jackets and sweaters. The factory will be heavily automated, Ms. Land said, enabling her company to keep costs manageable and compete with overseas workshops.

“Reshoring is not going to happen overnight, but it is happening, and it’s exciting,” she said. “If you place an order offshore, there is so much uncertainty with a longer lead time. All of that adds up.”

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