They could, and probably should, but then we run into the possibility of a zero sum game. First, that is pretty much all of the countries which produce our cons

They could, and probably should, but then we run into the possibility of a zero sum game. First, that is pretty much all of the countries which produce our consumer goods, and might I add, buy our debt. Second, the CEOs of those companies are going to get really pissed if their products go up in price. So they'll retaliate politically, but also pressure the other country to raise its tariffs on our exports. Speaking policy only, an option to take is to make it cheaper overall for companies to manufacture here. Define a set of industries you want back in America, and reduce or eliminate their corporate income tax based on a certain number of employees and plants. Then even with the environmental and labor laws in place, they'll still see it's more economically feasible to return.