How did Spanish and Portuguese contribute to the loss of Indigenous languages in South America?

The decline and loss of Indigenous languages in South America following European contact resulted from a combination of factors, including the direct impact of colonial administration, missionary activities, and the broader process of acculturation into European society.12

Spanish and Portuguese authorities contributed to this loss in several ways:

• Administrative and Missionary Use: Colonial powers often promoted specific, widespread Indigenous languages—such as Quechuan in the Andes and Tupí-Guaraní in Brazil—as lingua francas to facilitate government administration and religious evangelization. While this helped some languages survive, it frequently led to the displacement and extinction of smaller, local Indigenous tongues.134
• Acculturation and Bilingualism: As Indigenous populations were absorbed into colonial structures, many became bilingual, eventually shifting to Spanish or Portuguese for public transactions and social advancement. Over time, this often led to the abandonment of native languages in favor of the dominant European language.14
• Systemic Disruption: The conquest and colonization process, characterized by violence, disease, and the forced relocation of peoples, decimated many Indigenous communities, directly causing the extinction of numerous languages.12

While some languages like Guaraní have maintained a strong presence, many others have vanished as populations disappeared or assimilated into the dominant colonial culture.14