At the beginning of the eighteenth century most European Jews lived in restricted settlements and urban ghettos, isolated from the surrounding dominant Christian cultures not only by law but also by language, custom, and dress. By the end of the century urban, upwardly mobile Jews had shaved their beards and abandoned Yiddish in favor of the languages of the countries in which they lived. They began to participate in secular culture and they embraced rationalism and non-Jewish education as...