Today we welcome a guest post from Maddalena Marinari, author of Unwanted: Italian and Jewish Mobilization against Restrictive Immigration Laws, 1882-1965, available now from UNC Press. In the late nineteenth century, Italians and Eastern European Jews joined millions of migrants around the globe who left their countries to take advantage of the demand for unskilled labor in rapidly industrializing nations, including the United States. Many Americans of northern and western European ancestry regarded these newcomers as biologically and culturally inferior—unassimilable—and by 1924, the United States had instituted national origins quotas to curtail immigration from southern and...