 NYC was once called the largest German, Greek, Irish, Italian, Polish and Russian communities outside their representative countries of origin.Sometimes classified an ethnic group by some demographers and sometimes as a religious identity (Judaism), American Jews of various nationalities and various denominations, but most are American-born, are a major social presence in New York.An estimated 1 to 2 million alone in New York City and another 1 to 1.5 million live in surrounding areas, sometimes New York is referred to as the "world's largest Jewish city" since the mid-19th century.