Close to seventeen million people in the United States, approximately 6 percent of the total population, identified themselves as Italian Americans in the 2016 census. Constituting the nation’s fifth largest ancestry group, they are the descendants of one of the greatest diasporas in human history. Since 1860, twenty-nine million Italians have left their homeland for better opportunities worldwide.

Close to six million of them have settled in the United States with about five million arriving prior to World War I. Along with other European groups of the great transatlantic migrations of 1870–1920—Jews, Poles, Croatians, and Finns—they became an essential part of the American working class, building, shaping, and enriching its life and culture.