More than 300 prominent historians, including Simon Schama and Niall Ferguson, are warning voters that if they choose to leave the European Union on 23 June they will condemn Britain to irrelevance. In a letter to the Guardian, the academics and writers argue that the referendum offers a chance to underscore the “irreplaceable role” Britain has played, and should continue to play, in Europe’s history. “As historians of Britain and of Europe, we believe that Britain has had in the past, and will have in the future, an irreplaceable role to play in Europe,” the letter says. “On 23 June,...