(his footnote cites Dan Vogel's Indian Origins for more exploration of this. Indian Origins is another great read, and can be found online now:Another school of thought proposed that the original inhabitants of the New World arrived there as a consequence of the dispersion from the biblical tower of Babel. In 1652, Sir Harmon l'Estrange published a book expressing that view, and in the eighteenth century Samuel Mather and Pierre de Charlevoix published other books in that vein.
Like the lost tribes school of thought, the tower of Babel school had advocates well into the early nineteenth century.
http://www.signaturebookslibrary.org/indian/preface.htm
The most predictable thing about Joseph Smith is that he borrowed ideas from other places. Yes, he pieced them together in a unique way that attracted people, but he really wasn't coming up with original ideas on his own. He wanted to cover both bases, both myths that were popular in his time period. (or the author of the Book of Mormon wanted to do so...)