Sentence:  The lords of Tlatelolco were greatly angered over this and said, one to another, "These <WSD>Aztecs</WSD> believe that we are of an alien lineage. Do they not know that we are <WSD>Aztecs</WSD> like them[?] / (= los señores de Tlatelulco, recibieron mucho enojo y pesadumbre, y dixeron entre sí mesmos: estos mexicanos imaginan que nosotros somos de diferente generacion quellos; no saben que somo mexicanos) [1867 edition] 
Meaning of the word marked with <WSD> tags:  A Mexica.