What is the recognition of the harmonious coexistence of diverse cultural groups in a society called?

Multiculturalism 

It is the term used to describe a certain group of people with distinct cultural norms and language being recognized in the society. This term is highly applicable to a marginalized group of people such as the African-Americans, LGBT people, and women. 

The recognition of their coexistence certainly creates a harmonious relationship among the members of the society. 

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