A historian once speculated on what would happen if a time-traveller from 1945 arrived back in Europe just before the First World War, and told an intelligent and well-informed contemporary that within thirty years a European nation would make a systematic attempt to kill all the Jews of Europe and exterminate nearly six million in the process. If the time-traveller invited the contemporary to guess which nation it would be, the chances were that he would have pointed to France, where the Dreyfus affair had recently led to a massive outbreak of virulent popular antisemitism. Or it might be
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