Donald Trump's election as U.S president sparked warnings of damaging trade wars and an end to globalization as we know it. So far, those predictions haven't played out.

National security has been used to justify some pretty silly protectionism in the United States. The Berry Amendment, to pick an egregious example, prohibits the Defense Department from importing any kind of clothing, including "outerwear, headwear, underwear, nightwear, footwear, hosiery, handwear, belts, badges, and insignia." The International Trade Administration, an arm of the Commerce Dept., implausibly insists that the Berry Amendment "has been critical to maintaining the safety and security of our armed forces."