The series fetishized the black models' bodies, particularly their rear ends, implying that objectification and violation were acceptable things to do to African-American women. From the way this article has been going, you've probably guessed that this specific form of racism dates back even further than the '70s. In the 1800s, Saartjie Baartman was essentially a freak show exhibition. Nicknamed the Hottentot Venus, Baartman was gawked at on account of her large backside.
Bibliotheque Nationale de France (NSFW)
"My lord, Rebecca. Gaze upon her posterior."
On account of this being the 1800s, though, Baartman was also subjected to humiliation and sexual abuse until she sadly died (NSFW) of venereal disease at 25. So maaaybe Kardashian's magazine cover isn't the most offensive moment in the history of this pose?