> Did you ever think that funding, friends, family, culture, finances, local crime and many other things affect studying and results in school  Those factors are nothing compared to genetics. Additionally, family and culture are determined by genetics. Funding is irrelevant.  > quality of teaching   Lol. Quality of teaching is irrelevant. Teachers have been obsolete since dial up.  > US public schools are in general a pretty shit example  Blacks are retards in Africa, too. Not just in the US.  > normalisation of crime and poverty in manu areas   Again, genetics.  > Even if you claim IQ differences, you can overcome those easily with better teaching and encouragement for education.   No, you cannot over come IQ differences. The US army has determined that anyone with an IQ of 83 or lower is too stupid to do anything but dig holes