Seafarers of the Old World could come to America by chance, caught by a storm or strong current, like Kuro-Civaux. These "aliens" would be unlikely to have a major impact on the Indians ... So if between the Old and New Worlds committed systematic regular flights! Then it would have been established and these cultural contacts. However, no evidence of such regular contacts there. They are not found in the Americas. Of course, we can not state categorically that in the future will not be able to find them. Perhaps archaeologists are lucky enough to find in the land of the New World traces of Egyptian, Phoenician, Roman, Etruscan, or any more "Columbus" discovered America centuries before this Columbus (in fact there were also discovered traces of the Vikings for, five hundred years before Columbus !). It is possible that archaeologists, divers will be able to find at the bottom, near the coast of the New World, the remains of ancient ships crossing the Atlantic or the Pacific Ocean - it is found off the coast of Europe or Asia shipwrecks, had lain under the water two or even three thousand years!