Joeamonroe has my sympathy; African history is vastly ignored by people in general. I myself knows very little about African histories. Egyptian Empire, Nubia, and Bantu are the only ones I am familiar with, and that's only because they can be played as major power in the game "Rise of Nations".
We should try to undersand that history is merely a prospective. We only learn history for our benefits. Education institutions simply do not have time, budget and manpower to change the history textbooks to open up people's interest in histories and cultures of vastly foreign people.
Look at this scenario; most of the education institutions focus on their own national histories first. Once people have firmly good POW towards their own country, they slowly introduce different cultures and histories that are fairly linked and supporting our POW. And when our brain is firm about what's good and bad, we introduce a bit foreign cultures and histories to look as a contrast. We even start to learn about some fairly foreign cultures and histories due to economic relations, for instance. Africa is easily seen as lawless, chaotic and declining continent, something many education institutions use as example when their own countries start to fail politically.
And to be quite honest, majority of people simply don't care. Many of them simply want to pass the course to pursue different goal... and they have plenty of other things they could do rather than arguing who was right or wrong thousands of years ago. People start to learn a bit when such requirement for knowledge is necessary. Americans slowly learn more about the issues in Iraq because something's going terribly wrong in Iraq that's costing a lot of money, human lives and growth of terrorism around the globe.
There's an old saying, ignorance is a bliss. Some people take this seriously. This era demands immense competition in youth population, and many of them decided not to care how the politic and history are written, but to get good education, get a good job, find happy marriage and so forth. It's a major set-back to historians, but that's the reality.