Here are some examples:
* Correct: The students in the class come from a variety of ethnicities.
* Correct: She is proud of her Hispanic ethnicity.
* Correct: Ethnicity is a complex and multifaceted concept.
Capitalization rules for ethnicity:
* Proper nouns: If "ethnicity" is used as part of a proper noun, it is capitalized. For example, "Hispanic ethnicity" or "Irish ethnicity."
* First word of a sentence: As with any other word, "ethnicity" is capitalized when it's the first word of a sentence.
If you are unsure whether to capitalize "ethnicity," it's always best to err on the side of caution and not capitalize it.