Was there Pre-Columbian Contact between Polynesia and America?
Most of what is written on this About.com article has been posted here before. However this one paragraph does stand out to me:
DNA studies of coconuts (Cocos nucifera) growing today in Ecuador and reported by the Spanish conquistadors indicates that they originated in the Philippines, and were brought to Ecuador by seafarers ~2250 years BP (Baudouin and Lebrun 2009).
This makes the TransPacific introduction of coconuts slightly later than the evidence for bananas along the same route, and both of them in the ball park range for the Tlatilco migrations [there is a large range of good evidence for diffusion between Southeast Asia and Indonesia on the one hand and South America on the other at about 500 BC (Radiocarbon date not adjusted) and this date would have both bananas and coconuts established in South America by 250 BC. About this time there are even indications for DongSon decorative techniques showing up in South America, and possibly even metalworking (?bronzeworking) and the lost-wax method of casting metal objects.]
I also wonder if the coconut palms were established in the West Indies earlier and from the other direction, as seems likely from other evidence: I don't know of any DNA studies done on them to investigate the possibility.
Best Wishes, Dale D.