Denmark’s biggest exports include Ozempic , Carlsberg and Lego. But now, European leaders think it has something more valuable to sell: an immigration system tough and effective enough to neuter the hard right and keep mainstream parties in power. Mette Frederiksen, the Danish prime minister, has achieved what many center-left governments of recent years have found impossible: getting reelected. In an age when incumbents keep getting hammered at the ballot box, many in Europe are looking to the