It's my observation that some Bahá'is suck up to Native Americans. For example, they'll claim that the White Buffalo Calf Woman was a prophetess (see article in
BahaiTeachings) when this notion conflicts with our teachings.
Regarding your questions: We cannot possibly add names of people we (or anyone else) think might Lesser Prophets to those found in the Qur'án, the Bible and our own Scriptures. For only these can we consider authentic Books.
(Lights of Guidance, #1696)
Here's some context:
"Regarding your questions: we cannot possibly add names of people we (or anyone else) think might be Lesser Prophets to those found in the Quran, the Bible and our own Scriptures. For only these can we consider authentic Books. Therefore, Joseph Smith is not in our eyes a Prophet." (Letter written on behalf of Shoghi Effendi to individual, 13 March 1950)
The questioner was asking about the Book of Mormon and Joseph Smith. The quote above doesn't show we can't speculate about previous Messengers of God:
". . . the Manifestations of His Divine glory and the Day Springs of eternal holiness have been sent down from time immemorial, and been commissioned to summon mankind to the one true God. That the names of some of them are forgotten and the records of their lives lost is to be attributed to the disturbances and changes that have overtaken the world."
-Baha'u'llah
It's an individual's choice whether or not they want to consider White Buffalo Calf Woman a Manifestation of God. She's very ancient. There's no contradiction.
It is possible the Indians of the Americas were influenced in the remote past by Prophets in Asia. But again, as there is nothing in our teachings about it we cannot do more than speculate."
(Lights of Guidance, #1576)
In the Tablet to Amir Khan, Abdu'l-Baha answered the following question about Native Americans: "Did the ancestors of Native North Americans cross over the Bering Strait?" He replied:
"In ancient times the people of America were, through their northern regions, close to Asia, that is, separated from Asia by a strait. For this reason, it hath been said that crossing had occurred. There are other signs which indicate communication."
Also, he answered another related question: "Were Messengers of God sent to North America?" He replied:
"Undoubtedly, in those regions, the Call of God must have been raised in ancient times, but it hath been forgotten now."
So the Native Americans received divine revelation.
Here's an interesting
possible comment about Native American Messengers by Abdu'l-Baha when he visited a museum in New York City (which is recorded in
Mahmud's Diary):
Today, at the invitation of Juliet Thompson, ‘Abdu’l-Bahá went to amuseum near His house. On the first floor there were statues, figures of animals and a collection of relics of early American civilization. On observing these objects, ‘Abdu’l-Bahá said, “From these things it appears that America had a great civilization in ancient times.”