The book North American Indians by Lewis Spence makes a comment about the Shoshoni tribe:
"The Shoshoneans or "snake family" of Nevada, Utah or Idaho comprise the root-diggers, Comanches, and other tribes of low culture. These people, it is said, are probably nearer to the brutes than any other portion of the human race on the face of the globe." "Yet these debased creatures speak a related dialect and partake in some measure of the same blood as the famous Aztec race whoo founded the empire Anahuac, and raised archetectural monuments rivalling the most famous structures of the ancient world."
Well, I have read in the books of Gavin Menzies that Shoshoni Indians have a linguistic relationship with the Chinese spoken in the Cham Cham region. This suggests that the Aztecs have a racial mixture with the Chinese. The books of Gavin Menzes demonstrate that the Chinese were all over North America.
But I don't think it was just by sea that they made their way there, I think that the "underground express" magnetic rail train was functioning even thousands of years ago.
Cheers to all!