All I can say on the subject is that English blacks are behaving differently then USA blacks or French blacks. USA blacks are the stupidest imho. there are several reasons for that.

1. American culture is stupyfing - A culture argument.
2. They close themselfs in ghettos taking away learning curve opportunities - Genotype contra Fenotype argument
3. They were decendants of slaves that village elders sold to slave masters. In other words they were the stupidest of the stupidest. - Demographics argument.
4. You can say that blackness of skin is somehow related to cognitive difficulties - Hardcore genotype argument.

Im more inclined into a demographic argument. You can see the process of migrating the needy, motivated part of population. and leaving behind unneedy and unmotivated parts of population. Mostly you can see a difference between capital and near capital cities.

If you can see the disparity in living in various part of EU or Africa it doesnt mean nothing else but of exploitation. Not only a resources but human resources as well, that goes into the rich cities.

There are a lot more explanations then just saying blacks are stupid. You need to be more specific. If you unjustifiably generalise its not a good sign of IQ you seem to be proud being white. Or maybe you are not proud of it and you need to find someone that is worse than you. You can always find those is you want, so its not that hard to achieve.