Skin of Blackness

Race

The Book of Mormon chapter summary, 2 Nephi 5, published 1981: 1

The Nephites separate themselves from the Lamanites, keep the law of Moses, and build a temple—Because of their unbelief, the Lamanites are cursed, receive a skin of blackness, and become a scourge unto the Nephites. About 588–559 B.C.

The Book of Mormon chapter summary, 2 Nephi 5, changed December 2010: 2

The Nephites separate themselves from the Lamanites, keep the law of Moses, and build a temple—Because of their unbelief, the Lamanites are cut off from the presence of the Lord, are cursed, and become a scourge unto the Nephites. 

References

References
1 The Book of Mormon, published 1981 – https://archive.org/details/bookofmormonanot00salt
2 The Book of Mormon, 2 Nephi 5 – https://www.churchofjesuschrist.org/study/scriptures/bofm/2-ne/5?lang=eng