We should have a separated look at the regions north and south of the Sahara. In the countries north of the Sahara stagnates the economy, because of the Arab Spring amongst other things.
We concentrate on the countries south of the Sahara today, the so called Sub-Saharan Africa.
Africa is the largest national economy in that Region. It has large natural resources, a working industry, a financial service sector and a widespread transport infrastructure. South Africa stands for 30% of the GDP in that region.