In the United States, race and ethnic categories persist because most people "choose" partners that they believe belong to their own racial category. This practice is known as

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Endogamy refers to the practice of marrying within one's own social group, which can include race, ethnicity, caste, or religion. This practice contributes to the persistence of distinct racial and ethnic categories by encouraging individuals to choose partners who they perceive as belonging to their own racial or ethnic group.

In the United States, Race and Ethnic Categories Persist Because