The Nordic nations have similar cultures because they share similar language.
One of the two main differences between the governmental structure of the Songhai kingdom and the governmental structures of Ghana and Mali is that Songhai was divided into five provinces, while Ghana and Mali had strong central governments. Another difference is that Ghana and Mali's governments were based mostly on religious ideals, while Songhai was not.
The correct answer is - North Africa.
North Africa is the region in Africa that has its main economic activities based around the production of oil phosphates and natural gas. The reasons for this are that the region has solid amounts of reserves of oil and natural gas in its territory, but also because big portion of the other economic activities are restricted because of the geography of the region. This region is almost entirely covered by desert, with little pockets that have Mediterranean climate along the coast. That is not allowing for lot of economic activities to take place, so the oil and the natural gas are by far the most exploited and bring in the biggest income.
