Anti-Jewish bigotry spiked as Jewish immigration numbers surged

Evidence

However, when the number of Jews grew dramatically starting in the late-nineteenth century, so too did bigotry against them. At a time when rapid industrialization, urbanization, and mass immigration were unnerving the dominant White Protestants, Jews became associated with the purported hordes of inferior White races overtaking America. That this new wave of Jewish immigrants were indigent only exacerbated White Protestant nativism. — Sahar F. Aziz, The Racial Muslim, 255