I'm unfamilair with Kenley Mays but do recall statements about Native Americans and other groups ..
We are heartened at the prospect that from indigenous peoples of this vast oceanic area, the Ainu, the Japanese, the Chinese, the Koreans, the Okinawans, the Micronesians, the American Indians, the Eskimos, and the Aleuts vast numbers will soon enter the Faith.
(Compilations, Japan Will Turn Ablaze, p. 112)
"He has always been very anxious to have the Indians taught and enlisted under the banner of the Faith, in view of the Master's remarkable statements about the possibilities for their future and that they represent the aboriginal American population.
(Compilations, Lights of Guidance, p. 528)
American Indians
You must attach great importance to the Indians, the original inhabitants of America. . . . Should these Indians be educated and properly guided, there can be no doubt that through the Divine teachings they will become so enlightened that the whole earth will be illumined.
'Abdu'l-Bahá, in Tablets of the Divine Plan, pp. 31-32
IMPORTANCE OF THE AMERICAN INDIANS
Particular attention, I feel, should, at this juncture, be directed to the various Indian tribes, the aboriginal inhabitants of the Latin republics, whom the Author of the Tablets of the Divine Plan has compared to the "ancient inhabitants of the Arabian Peninsula." "Attach great importance," is His admonition to the entire body of the believers in the United States and the Dominion of Canada, "to the indigenous population of America. For these souls may be likened unto the ancient inhabitants of the Arabian Peninsula, who, prior to the Mission of Muhammad, were like unto savages. When the light of Muhammad shone forth in their midst, however, they became so radiant as to illumine the world. Likewise, these Indians, should they be educated and guided, there can be no doubt that they will become so illumined as to enlighten the whole world."
(Shoghi Effendi, Citadel of Faith, p. 16)
(Compilations, NSA USA - Developing Distinctive Baha'i Communities)