Differences between north africa and sub saharan africa

But for some on the continent, however, the widely-held perception is of two very different regions; Africa south of the Sahara desert, or sub-Saharan Africa, and north Africa. ... North Africa is predominantly Arab and relatively more developed.

Explanation:

john maynard keynes developed new economic theories in response to the stock market crash of 1929. great depression of the 1930s. first and second world wars. economic boom of the 1950s.

d. migration of french settlers into english colonies