Temple and Priesthood Ban
"Church records offer no clear insights into the origins of this practice. Church leaders believed that a revelation from God was needed to alter this practice"
- Official Declaration 2
Again, the first place to start as it relates to the Temple and Priesthood Ban is the explanation from the Church itself as documented in the Gospel Topics Essays. That link is below. Further below are other resources to add additional clarity
"Today, the Church disavows the theories advanced in the past that black skin is a sign of divine disfavor or curse, or that it reflects unrighteous actions in a premortal life; that mixed-race marriages are a sin; or that blacks or people of any other race or ethnicity are inferior in any way to anyone else. Church leaders today unequivocally condemn all racism, past and present, in any form."
-Gospel Topics Essays
The Church of Jesus Christ of Latter-day Saints -
Struggling with the History of Race and the Priesthood
LDS Perspectives Group and Black Latter Day Saints.org
There are now hundreds of thousands of black members of the church. Some residing in Utah are part of a lesser known group in Utah called the Genesis group. This is an interview of the Presidency of the Genesis group by LDS Perspectives group