Agreed... some of the East Coast indians suggest European ancestory. The Cherokee language is actually very similar to Greek and some ancient Hebrew artifacts have been found in obscure places like Oklahoma... I do believe some Asiana came across the land bridge as suggested, but do not believe Lied Ericson was the next to make it here.
Oops, Lief Ericson. Darn autocorrect...
There is proof that Chinese came to the west coast of North America in the late 6th century, and co-mingled with the native Americans. Historical Chinese records write of boat travelers trading with the Americans in the far lands now known as Mexico, and document plants that only grow in America. Also verbal records of some Americans correlate to the Chinese records. I studied this over forty years ago, was controversial back then because Columbus was "supposed" to be the first.
Cherokee and Greek are really different. I mean REALLY really different. I’ve not studied Cherokee specifically, but i have studied other Iroquoian languages like Mohawk and Oneida—whoa. A brain trained on Latin and Greek and other Indo-European languages has to get used to a completely different way of doing grammar. Just to give you an example, here’s the Cherokee pronoun system:
http://wiki.langwiki.info/Cherokee:Pronouns
Way more complicated than the Greek one. And Iroquoian languages pretty much don’t have any adjectives, where Greek has tons of them.
I have not seen any convincing relationship demonstrated between any American Indian language and any Old World language.