Other large ancestry groups are Irish (10.8 percent), African-American (8.8 percent), English (8.7 percent), Mexican (6.5 percent) and Italian (5.6 percent). Twenty million people, or 7.2 percent, simply called themselves “American.” (Not to be confused with American Indian, which another 7.9 million people reported.)
Irish, Italian and German ancestries (in that order) dominate in the northeastern United States, with 30 percent of residents claiming at least one of the three. You’re most likely to meet descendants of Germans in the Midwest, where nearly a quarter of census respondents have Deutschers in their pasts. African-American and “American” heritages are most common in the South, with 14 percent and 11.2 percent, respectively. In the US Southwest, Mexican (16 percent) and German (13.3 percent) ancestries top the list.