Joseph Smith had a plan to make the Lamanites "white and delightsome"

A revelation given to Joseph Smith in 1831 which encouraged the implementation of polygamy by intermarriage with the Indians in order to make them a “white and delightsome” people.

The text of W. W. Phelps' 1861 recollection of the revelation:

In 1861, 30 years after it was said to have been given, W. W. Phelps wrote from memory his recollection of what he claimed was the revelation given in 1831 by the Prophet:

Part of a revelation by Joseph Smith Jr. given over the boundary, west of Jackson Co. Missouri, on Sunday morning, July 17, 1831, when Seven Elders, viz: Joseph Smith, Jr., Oliver Cowdery, W. W. Phelps, Martin Harris, Joseph Coe, Ziba Peterson, and Joshua Lewis united their hearts in prayer, in a private place, to inquire of the Lord who should preach the first sermon to the remnants of the Lamanites and Nephites, and the people of that Section, that should assemble that day in the Indian country, to hear the gospel, and the revelations according to the Book of Mormon.

Among the company, there being neither pen, ink or paper, Joseph remarked that the Lord could preserve his words as he had ever done, till the time appointed, and proceeded:
Verily, verily, saith the Lord your Redeemer, even Jesus Christ, the light and the life of the world, ye can not discerne with your natural eyes, the design and the purpose of your Lord and your God, in bringing you thus far into the wilderness for a trial of your faith, and to be especial witnesses, to bear testimony of this land, upon which the Zion of God shall be built up in the last days, when it is redeemed.

[I]t is my will, that in time, ye should take unto you wives of the Lamanites and Nephites, that their posterity may become white, delightsome, and Just, for even now their females are more virtuous than the gentiles.

Gird up your loins and be prepared for the mighty work of the Lord to prepare the world for my second coming to meet the tribes of Israel according to the predictions of all the holy prophets since the beginning; …

Be patient, therefore, possessing your souls in peace and love, and keep the faith that is now delivered unto you for the gathering of scattered Israel, and lo, I am with you, though ye cannot see me, till I come: even so. Amen.