Just look at countries that are and have been primarily Black. What kind of progress do you see there? Economic? Social/human rights? Violent crime? Women's rights? Medicine? Disease? Technology? Life expectancy etc. What you see a wretched record of accomplishment. Which does not mean blacks cannot be very successful following or appropriating successful white culture. Despite the past, Blacks living within societies originated by Whites have it better than most if not all Black originated societies (on average). 

I don't wish to keep any non-white race down to the extend they are "down", but I also don't want to through away what has been a very successful if imperfect culture. I do not wish to denigrate it for its imperfections. So called progressives/liberals and SOME members of some other cultures seem to want to consciously or unconsciously denigrate & destroy it.

With regard to slavery, it did contribute to relative US economic dominance but it doesn't negate Faber's argument.