alternatehistory.com

Other than the Norse, there is no unambiguous pre 1492 contact between the Americas. There is a hypothesis involving pre-literate Pacific Islanders and sweet potatoes, but the link is weaker in comparison. The POD is as soon as humans have boats, but it has to be a literate society of some kind. The colonizer does not have to make a major state that lasts, but have to leave a record similar to the Norse at minimum, like a settlement or two, weapons not of a Native American origins, and especially something in a written language. Bonus points if it is not a Chinese dynasty of any kind. For the purposes of this discussion, Mormon theology is not allowed as an answer as there is nothing to back it up, and non-Mormons widely recognize Joseph Smith as a fraud.
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