Like the bedtime stories of Joseph Smith
Joseph Smith is the founder of the Mormons; Bedtime stories are religion. Early Mormons viewed African-Americans as “cursed” and thought that they were not only inferior socially, but also spiritually.
Although early Mormons believed dark skin to be a curse; they believed it to be an ancient curse, I believe the line is referring to the next line, the prosecution of early Mormons.
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