Other places were able to get their own civilization thanks to one reason or the other, e.g. Eastern China.
All that has to do with achievements of different societies. Now at the individual level, how do we know whether groups with Caucasian genes would have been able to develop a civilization if they had lived in a place with the same geography and conditions as Sub-Saharan Africans? We can't know.
What we know though is that the conditions are there now for individuals with predominantly Sub-Saharan ancestry to show what they are capable of. Eventually they'll produce someone like Mozart, Newton, Confucius, Sun Tzu, Jabir ibn Hayyan or Abbas ibn Firnas. Or maybe they won't. Perhaps too early to tell.
>You have to keep in mind though that Timbuktu for example didn't spring out of nothing but thanks to Muslims from the North.
This would be like calling Sicilly an Arabic city. Timbuktu grew as a center of trade within Black Africa as a result of trade with the northern Arabic and Arabized Berber states. This does not make it any less valid as an example.
PS: May not look like it, but I largely agree with you.
Not necessarily. The first big European civilization was the [Cucuteni-Trypillian culture](http://en.wikipedia.org/wiki/Cucuteni-Trypillian_culture) which developed north-west of the Black Sea and was quite ahead of what was developing in the Middle East or elsewhere at the time (they had better pottery, barter tokens, biggest settlements in the World - up to 15000 people-, and were possibly the authors of the first writing system, 1000 years before the Summerians).
http://en.wikipedia.org/wiki/File:Feheregyhaza2.jpg
Now compare that with anything build by the Great Zimbabwe, Old Ghana or Timbuktu. Don't worry, that fortified church is just one of many.
Thanks for the Sicillian clarification BTW. I'll be sure to go there next time I'm in Greece. Oh, wait...