What geographical feature contributed to why North Africa developed so differently from southern Africa?

the sahara desert is the reason why North Africa developed differently from southern Africa

mythology i believe

the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.