I do believe, in part, it has to do with geographic location and ethnic/racial ties. The international community and the U.S. have been, let’s say, “selective” in how they react to crises in the world. However, I believe there are other important factors to consider. I believe a more important factor is China. China, for obvious reasons, is opposed to economic sanctions on Sudan. China is a major economic player in the world as well as a political one. Another factor is the northern Sudanese ties with countries in the Middle East. So it’s not just an African problem.
There are also Chad and the Central African Republic to consider. And then there are internal factors that many dismiss. It’s a gross simplification to state that the northern Muslim population is opposed to the southern African population. For example, the southern African population is not united. There are numerous ethnic/tribal conflicts, some of which are enabling the government and some of which have formed their own militias.