There should be no gap between black or white. Difference is only of skin color remaining other things like brain,blood are same. White are raised in good,rich society and they have opportunities for good health,education neither to black. The thing is that we have to change our surrounding and environment. We have make world a better place. If a black people is upraised in good surrounding there will be no difference between them. They will have equal rights and power.
So,we can't say that blacks are the least intelligent race on the earth only the thing is we have to change and from now. If opportunity is there they have to seek it.