Crossword Genius

South American pioneers of terrace farming (5)

Ross

I believe the answer is:

incas

(Other definitions for incas that I've seen before include "Ancient inhabitants of Peru" , "Members of ancient Peruvian race" , "Ancient Peruvians" , "People from Andes who settled in Peru" , "conquered by Spain" .)

I've seen this clue in The New York Times.
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