Bookstores

So I was at Barnes and Nobles the other day because of course I love to read and buying books is my hobby. I usually get my books from Borders but I don't live close to one anymore. I am all into romance novels and erotica but I decided I wanted to read something different this time. I went into the African American section and wow! there were a total of 2 shelves with books by African American authors. I'm usually oblivious when it comes to racism. I'm not saying that this particular bookstore is all about racism but why should I have to go to a special store to find books by African American authors. I would think with a store as big as Barnes and Nobles there would be more of a variety. I mean this store was huge with a coffee shop and everything. So why would this section of the store be sooooo small. There are so many authors of African descent I would expect so much more. We have been main stream since the 18th century with authors like Phillis Wheatley and Olaudah Equiano. And then there is the Harlem Renaissance which was the high point that pulled our authors to the fore front. So why would we only be granted such a small section of a book store or a library where books are a part of the industry. I am not about making such a bold statement. I, more times than I should, look past such obvious discrimination but this just boggled my mind. I see so many other things in this store like coffee, toys, a TV, games and I think with all of this extra space why can't this section be bigger?