Cultural Pluralism: This is when small groups within a larger society maintain their unique cultural identities while also contributing to the larger culture's overall social economy.
Melting Pot: A metaphor for a society where many different types of people blend together as one. This is often used to describe the assimilation of immigrants in the United States.
Acculturation: The process of adopting the cultural traits or social patterns of another group, but still maintaining some aspects of your original culture.