People who gave us the words "llama" and "quinoa" (5)

I believe the answer is:

incas

(Other definitions for incas that I've seen before include "Peruvian natives" , "People from Andes who settled in Peru" , "Old people coming from South America" , "People of ancient Peru" , "Members of ancient Peruvian race" .)

I've seen this clue in the USA Today.

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