In Denmark, a grocery store chain used a black star. In Canada, it was a maple leaf.

President Donald Trump’s trade war inspired new country-of-origin “Made In” labels this year as shoppers outside the U.S. looked to avoid buying American-made goods and shop local instead. In the U.S., though, the “Made in USA” brand is losing its domestic appeal.

Country-of-origin labeling is designed to be a stamp of authenticity and quality. Countries police their own rules to ensure products labeled “made” or “assembled” in their country really were made or assembled there and that they meet national standards.

When the Copenhagen-based think tank 21st........

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