I know you probably don’t have an hour to spare to listen to a lecture on the evidence for pre-Columbian contacts between Polynesians and South American cultures, but Dr Lisa Matisoo-Smith does a really good job of galloping though the DNA and archaeological evidence from humans, commensals and livestock in a recent podcast from the Bishop Museum. She even mentions crops.
The bottom line? The human anatomical and artifact evidence is compelling, but the DNA is not cooperating yet. At least the human DNA. But listen to it. While you’re preparing dinner or something. I just wish the Bishop had thought to put the slides online too.