One thing that many people don't also realise is that Africa is internally broken into 3 or 4 major blocs. West Africa from Senegal through to Cameroun are a bloc, central Africa another, the horn, another and the southern countries.
West African countries have relatively good communication and transport across themselves, but not to the southern countries.
The average American probably knows a lot more about the Congo than the average Nigerian, hard as that may be for you to believe.
South Africa and Namibia are very close economically and culturally. Same with the two small countries in SA, and I believe Zimbabwe used to have a lot of trade too, before the latest problems.
South Africa is rich, but the West African economic zone is almost as rich.
West African countries have relatively good communication and transport across themselves, but not to the southern countries.
The average American probably knows a lot more about the Congo than the average Nigerian, hard as that may be for you to believe.