OP doesn't want to sound like a dick, but generalized an entire continent by saying it's in the "stone age"?
This is downtown Harare (Zimbabwe)
photo hostDoes the entire West look like this (detroit)? (answer: no)
photo hosting sitesThat's a terrible example to prove a point. Like I said when Westerners have been in control of Africa it has become relatively modern and developed in South Africa and Zimbabwe formerly Rhodesia. When the whites were kicked out of the country and the land the country collapsed into a horrible corrupt leadership (Mugabe) and hyperinflation if anyone needs reminding.
I'm not saying Black people can't develop their country but the culture predominant in Africa does not led itself toward economic progress. Many African cultures are still nomadic for crying out loud how will they develop into the economic systems we call modern?