The well-documented cultivation of the sweet potato in East Polynesia, plus the much more arguable pre-European presence in Polynesia of other cultigens as well as some artifacts and human genes from South America, has been explained by various authorities as either the result of one-way raft voyages by South American sailors to Polynesia, or of two-way canoe voyages by Polynesian sailors to South America and return. Although the simplicity of imagining a raft voyage from South America to Polynesia is appealing, we should not dismiss the possibility that some particularly daring Polynesian sailors might have made a round-trip voyage.
"Polynesian-South America Round Trip Canoe Voyages,"
Rapa Nui Journal: Journal of the Easter Island Foundation: Vol. 8
, Article 2.
Available at: https://kahualike.manoa.hawaii.edu/rnj/vol8/iss2/2