During the African Expanse, which united the various nations of Africa, the nations on the south part of Africa was in opposition to the many countries in central Africa. Those on the north faced the threat of Egypt, which has suddenly grown into a level that it could contend with the more advanced nation of the world.
Most of North Africa came in conflict with Egypt and had requested an agreement with the nations in Central Africa that both parties would not attack each other but focus on their corresponding enemy.
Central Africa lost, and the South took over. At that time, Egypt was expanding on all fronts challenging the other nations in the North African continent and the nations in the Caliphates.
By the time South Africa won their conquest, the Northern Countries immediately surrendered as they were already losing. Libya, Tunisia, and parts of Algeria had already been conquered. Egypt was expanding its conquest to the nearby nations.