Fear that Jewish law bred disloyalty was not limited to political elites; leading European philosophers also entertained the idea. Kant argued that the particularistic nature of “Jewish legislation” made Jews “hostile to all other peoples.” And Hegel contended that Jewish dietary rules and other Mosaic laws barred Jews from identifying with their fellow Prussians and called into question their ability to be civil servants.

The German philosopher Bruno Bauer offered Jews a bargain: renounce Jewish law and be granted full legal rights. He insisted that, otherwise, laws prohibiting work on the Sabbath made it impossible for Jews to be true citizens. (Bauer conveniently ignored the fact that many fully observant Jews violated the Sabbath to fight in the Prussian wars against Napoleon.)

During that era, Christianity was seen as either a universally valid basis of the state or a faith that harmoniously coexisted with the secular law of the land. Conversely, Judaism was seen as a competing legal system — making Jews at best an unassimilable minority, at worst a fifth column. It was not until the late 19th century that all Jews were granted full citizenship in Western Europe (and even then it was short lived).

Most Americans today would be appalled if Muslims suffered from legally sanctioned discrimination as Jews once did in Europe. Still, there are signs that many Americans view Muslims in this country as disloyal. A recent Gallup poll found that only 56 percent of Protestants think that Muslims are loyal Americans.

This suspicion and mistrust is no doubt fueled by the notion that American Muslims are akin to certain extreme Muslim groups in the Middle East and in Europe. But American Muslims are a different story. They are natural candidates for assimilation. They are demographically the youngest religious group in America, and most of their parents don’t even come from the Middle East (the majority have roots in Southeast Asia). A recent Pew Research Center poll found that Muslim Americans exhibit the highest level of integration among major American religious groups, expressing greater degrees of tolerance toward people of other faiths than do Protestants, Catholics or Jews.