An ethnic group is a group of people that belong to the same natoinalistic or sometimes racial/cultural background.
Ethnic group is a group that shares a language, history, religion and some other physical traits. byMekhi.bur
africans latinos
china
Hispanic
asian alone
genicide is mass murder of a people of specific religion, ethinic group, or race
The Jewish, the gypsies, and the disabled
Ethnic group- a group of people who share the same ancestors, culture, language, or religion.
the hausa are the largest ethinic group in nigeria almost all hausa are muslims
Chinese and African Americans
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I am assuming you mean the United States. The third largest ethnic group in the US is African-American. Although technically not a single ethnic group, African-American is defined as one in the American census. It is preceded by German and Irish.
It is untrue to say that "everyone is a different ethnicity." By definition, an ethinic group is a set of many more than one person who share cultural values, so for each ethnic group there are many people who have that same ethnicity.