While Archer’s great-grandfather is American, Archer’s grandfather can be an Afrikaner, and he has many half siblings or cousins who are of African descent. And its Archer’s grandfather who emigrated to North America and had Henry Archer.
No. It appeals to the ignorant viewers that see Africa as one country, instead of a continent made up of many countries.
It makes more sense that the Augments unified a bunch of nations so that there are only five countries in Africa – North Africa, West Africa, Central Africa, East Africa, South Africa – that were each ruled by Augments.
It really depends on whether Augments will bend the Knee and swear loyalty to their former enemies like the Jaffa do. If Augment lieutenants and their human legions are flipping from side to side after the outcomes of complicated battles like a game of Othello that's one thing, but if Augments are inflexible and will not sincerely switch loyalty, then Augment soldiers, generals and kings will always have to be imprisoned or executed, which turns this land grab into Highlander.
There can only be one.