To this post made more than half a month ago, "The invention, development, and decipherment of writing" (12/30/22), after a couple of important comments on other subjects (Phrygian inscriptions; Egyptian, Mesopotamian, Chinese stimulus diffusion of writing), R. Fenwick made the following vital remarks, and just in the nick of time before comments closed:
@David Marjanović:
Heyerdahl obviously demonstrated that such a voyage wasn't physically impossible. There's just no reason to assume it actually happened.
Except that it actually did happen. It's true that Heyerdahl's specific settlement model has subsequently not held water – we know now that Polynesia was settled rather from the western Pacific and ultimately Taiwan – but at least one successful return voyage in the other direction was almost certainly achieved. And we do have at least one very powerful reason to conclude that it was: sweet potatoes. They've been widely cultivated by eastern Polynesian peoples since well before European incursion into the Pacific (the earliest ¹⁴C dates we have on sweet potato remains are from c. 1210—1400 AD, on the Cook Islands), but sweet potatoes are native to South and Central America, and early Polynesian seafarers most likely took on sweet potato cultivation as a result of direct trade with the Inca. There's even a singular but stark linguistic footprint of the interaction, as Proto-Eastern Polynesian *kumara "sweet potato" (cp. Māori, Rarotongan kūmara, Rapanui, Tuamotuan kumara, Marquesan kūma‘a, Hawaiian ‘uwala) is virtually identical to terms for sweet potato in the Quechuan languages (e.g. Cuzco khumara, Ayacucho kumar, Northern Pastaza kumal, Colonial Chincha cumar).
Other evidence for Polynesians visiting South America is unfortunately very thin, but I've read reports from a couple of archaeological excavations – in Chile, I think – where small quantities of avian bone have been recovered that are consistent with domestic chickens, a south-eastern Asian domesticate that formed a key part of Polynesian diets. I'll have to look into the literature a little further and see if the situation on the ground has improved regarding pre-Columbian chickens. There's also a recent study that also claimed a South American genetic component in portions of the Polynesian human population, but I haven't read the article yet.
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