"Cain might have been killed, and that would have put a termination to that line of human beings. This was not to be, and the Lord put a mark upon him, which is the flat nose and black skin. Trace mankind down to after the flood, and then another curse is pronounced upon the same race -- that they should be the "servant of servants;" and they will be, until that curse is removed; and the Abolitionists can not help it, nor in the least alter that decree. How long is that race to endure the dreadful curse that is upon them? That curse will remain upon them, and they never can hold the Priesthood or share in it until all the other descendants of Adam have received the promises and enjoyed the blessings of the Priesthood and the keys thereof. Until the last ones of the residue of Adam's children are brought up to that favourable position, the children of Cain can not receive the first ordinances of the Priesthood."
-"Intelligence, etc." by Brigham Young, General Conference 1859
If only Mormons were required to read general conference talks from 150 years ago. THEN would they feel a little more prompted to reevaluate the whitewashing of their history?