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“Although the effects of immigrants on the composition of the U.S. population were apparent by the census of 1870, it was the dramatic shift, between the 1880s and 1900s, in the sources of European immigration to the United States from northwestern countries to southeastern ones that excited and sustained public debate and comment. In 1882 . . . 13.1 percent came from southern and eastern European countries. . . . In 1907, these countries supplied 81 percent of a total of 1,207,619 European immigrants.”
-Source: Desmond King, Making Americans: Immigration, Race, and the Origins of the Diverse Democracy, 2009