The Book of Mormon references horses existing in pre-columbus days.
Of course, most scientist have debuked this.
There are many myths in American books archaelogy and history. In 2009 the Genome study found that the North american Indigineous people may not have come from the landbridge. they are not similar to siberian and Chinois lines from Asia. The Eskimos may be more attached than the First Nations peoples.
So another myth, that was generally accepted by millions has been debunked.