Thread has kind of gone off the rails...
Initially, it was an honest question, now discussions are beginning to revolve around White Slavery.
I think it's already being promoted a lot in society, especially in America. Watch any television show and in the commercials, you'll always see a Black person. In fact, there are a lot of mainstream companies whose entire commercial consists of either Blacks or white women, no white men.
Also, movies and television itself has adapted, putting blacks in formally white positions. Captain America retiring? Replace him with a Black guy. The examples are endless.
So, to answer the initial question, I think it is already being promoted to the maximum without getting totally crazy, rendering the question as moot.
Regarding you guys out there who are supporting White Female Slavery... Well have fun with your fantasies... Because that's all they are, fantasies.