What is the norm that requires people to find mates within a specific group or social category?

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Endogamy is the norm that requires people to find mates within a specific group or social category, such as religious, ethnic, or racial groups. Heterogamy refers to marriage between individuals who have different social characteristics, while exogamy refers to the requirement to marry outside of a particular social group. Polygamy refers to the practice of having more than one spouse at the same time.

What Is the Norm That Requires People to Find Mates