My point was quite simple anyway: that it's often said that the low IQ of blacks is the result of white racism/discrimination -- this explanation fails, as it can't explain the even lower IQ of blacks in societies where there are no whites.
IQ tests fail to measure the intelligence of blacks in a different culture. IQ tests are created by western standards of intelligence which do not necessarily translate across cultural bounds. Blacks in primitive African societies value completely different areas of cognitive thought than the western world.
Now, if you're referring to areas that are predominantly black in America, then the explanation still stands. Areas that are predominantly black are often poorer than areas that are predominantly white. This
is a result of racism.
Now, as to your experiment, I find it rather lacking. You're essentially saying that if we placed a group of, say, 3,000 black students into an educational system with all the benefits and finances of a predominantly white, suburban, middle class school system, the grades/IQs of the black students would still be lower than whites. I feel that there are several variables inherent in this experiment that prevent it from providing accurate results. For instance, the resistance of some youths to such an experiment; the subconcious bias in teachers/parents towards the black youths (even if this bias includes over-nurturing them because of the fear of psychological damage if they "fail"); the pre-existing conditions of poorer blacks and their delayed reaction to such a wealthy, new system; etc...
All in all, you can't deny that a history of racism has
something to do with the modern status of "black intelligence." Blacks have the same capacities to learn as whites do, but they are conditioned to such lower standards that it is not part of their understanding, or perhaps even concern.