You need to stick with me, this is what my doctoral disseration is on.
The founder of AKA was Madam CJ Walker, who had 8 daughters. Each daughter attended a different Ivy League college (or in some cases, their female counter part, like Radcliffe or Barnard). Well, Walker's daughters joined forces with their mom and established the first sorority for black women.
Incidentally, each daughter married an Alpha founder, except for the Yale daughter, who got stuck with a Sigma.