Answer: The correct answer is : The rapid influence of immigrants from parts of the world that are not from the north or west of Europe and Asia, that is immigrants from the south and east, affected the debates about the national identity of the United States because it caused anti-immigrant feelings based largely on the different appearance of those who arrived. These physical differences, such as men, women and children with olive skin and dark hair, were seen as inferior by pale-faced inhabitants, and concluded that they were bad for the well-beinf of the country.