This is pretty disingenuous, the vast majority of sickle cell cases are non-hispanic blacks. Hispanics and whites also get sickle cell. If you’re grouping all those ethnicities in there, you might as well include whites too.

It’s genetic. It’s more prevalent in some populations than others because sickle cell also makes one resistant to malaria, so the more common malaria has been somewhere historically, the more likely people descended from there are to have sickle cell.

Like how people of European descent are more likely to be resistant to the Black Death. Turns out diseases that kill lots of people apply significant selection pressure and those changes don’t vanish quickly unless they cause a problem that would prevent breeding in successive generations.