Page has ordered some caps from other countries, but he said that’s not easy. He spent eight months vetting a manufacturer in Bangladesh to make sure the quality, style and colors were what his customers wanted.

So when Trump said, as he did on Twitter last month, that he could order U.S. companies out of China, he’s making an existential threat to companies like Cap America.

“You can’t just snap your fingers and change the supply chain overnight,” Page said. “If China controls 89% of the market, you don’t have to be a rocket scientist to know it will be difficult to move production anywhere else.”

Whether Trump likes it or not, China has become the workshop of the world. Even as companies scramble to find suppliers in places like Vietnam and Bangladesh, few major industries can do without China’s massive, efficient capacity and transportation infrastructure.

Caleres, the Clayton-based shoe company, has shifted sourcing away from China in recent years but still buys 60% of its products there. Trump hit the shoe industry, along with diapers, televisions and many other consumer products, with a 15% tariff Sept. 1.