Racial Impurity and Gender Confusion

Here's a speculation. I'm reading John McWhorter's new book What Language Is (Gotham Books, 2011), which begins with a lengthy discussion of the difference in complexity among languages. Some have intricate systems of case, gender, or counting; others don't. This much I knew already. McWhorter argues, though, with numerous examples, that the "simpler" languages are usually the result of a