Nahuatl-speaking migrants moved a thousand miles south and became a hinge between Mesoamerica and South America. The Pipil of Cuscatlan and the Nicarao of Ometepe lived beside Chibchan peoples, trading obsidian and copper south and gold and Andean crops north. The relay was gradual rather than nonstop, and some traditional claims are flagged.
Written colonial accounts describe clear Nahua migrations, but excavations at Santa Isabel found material culture less Mexican than expected. The language is Nahua, yet how much population actually moved is unsettled.