This document summarizes United States immigration from 1820 to 2000. It describes the major waves of immigration and the ethnic groups that immigrated during each period. In the 1820-1880 period, immigrants included African slaves, English, Chinese workers, and Germans. From 1880-1930, most immigrants came from southern Italy and Jewish people fled Russian pogroms. Ellis Island processed millions of immigrants from 1850-1954. Immigrants settled across the country, with Italians concentrated in New York, Irish on the East Coast, Germans in the Midwest, and Mexicans and Central/South Americans in the Southwest. By 2000, the largest ancestry groups in the US were Germans, African Americans, Irish, Mexicans, and Italians