As an alumna of a predominantly white TBS chapter with a brother KKPsi chapter (also predominantly white), I can tell you that as far back as I can recall, there have always been chapters of both organizations at HBCU that have had calls, step shows, lines and the like. This isn't a recent phenomenom (relatively speaking). As for the history of these orgs, I'd suggest you visit their website:
http://www.kkytbs.org/