Immigrants into Spanish Texas who came from mixed Spanish and Native American heritage were called
a. Lipan Apaches
b. Mestizos
C. Vaqueros
d. Canary Islanders

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The term was used as an ethnic/racial category for mixed-race castas that evolved during the Spanish Empire. Although broadly speaking, mestizo means someone of mixed European/indigenous heritage, the term did not have a fixed meaning in the colonial period.

Explanation:

the first forms of writing came from them in the form of pictographs around 3100 bc.