In what ways were the city-states and civilizations of Africa diverse?

Answer 1

This one covers ancient Africa:
http://www.homestead.com/wysinger/africanhistory.html

This is a good link on Africa, it lists all the countries that make up Africa, you might find something there:
http://encarta.msn.com/encyclopedia_761572628/Africa.html

Here's another good link, that covers some of Africa's history:
http://www.ahtg.net/TpA/tpafrica.html