Italian Americans, or just Italians, Sicilian Americans, or Sicilians, is an ethnic group of Americans that either came from, or whose family originated from Italy or Sicily. Italian Americans are the fourth largest European ethnic group in the United States (not including American ethnicity, an ethnonym used by many in the United States; overall, Italian Americans rank seventh, behind German, Irish, African American, English, American, and Mexican American).
About 5.5 million Italians immigrated to the United States from 1820 to 2004. The greatest surge of immigration, which occurred in the period between 1880 and 1920, alone brought more than 4 million Italians to America. About 80% of the Italian immigrants came from Southern Italy, especially from Sicily, Campania, and Calabria. This was a largely agricultural and overpopulated region, where much of the populace had been impoverished by centuries of foreign misrule, and the economic measures imposed on the South after Italian unification in 1861.