5. Australian American
Median household income: $81,452
Americans with Australian ancestry are also on the list of the richest and most powerful ethnic groups. Australians started migrating to the U.S. in the 1850s during the California Golden Rush. They are not to be confused with American Australians (Australian citizens with American ancestry). According to this essay, most Australians and New Zealanders who came to America settled around San Francisco and Los Angeles.