Casta (Spanish: [ˈkasta]) is a term which means "lineage" in Spanish and Portuguese and has historically been used as a racial and social identifier. In the context of the Spanish Empire in the Americas, the term also refers to a now-discredited 20th-century theoretical framework which postulated that colonial society operated under a hierarchical race-based "caste system". From the outset, colonial Spanish America resulted in widespread intermarriage: unions of Spaniards (españoles), Amerindians (indios), and Africans (negros). Basic mixed-race categories that appeared in official colonial documentation were mestizo, generally offspring of a Spaniard and an Indigenous person; and mulatto, offspring of a Spaniard and an African. A plethora of terms were used for people with mixed Spanish, Amerindian, and African ancestry in 18th-century casta paintings, but they are not known to have been widely used officially or unofficially in the Spanish Empire.

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