3.) the North was more industrial and had more immigrants. Hope this helps :)
The correct answer here is to establish Germany's war guilt.
With this article, it is established clearly that the war was Germany's fault, and of her allies. Germany accepted this. What all of this means is that now as the both guilty and losing party Germany had to accept things the Allies demanded of her. The Allies had all the power in this negotiations.
All this is saying is that when the Europeans colonized Africa they did great damages to the social and political institutions of the natives on a local level, as opposed to necessarily a national level, due to the fact that power in Africa was relatively localized.