Letter to An African Muslim by Shaykh Abdalqadir as-Sufi ad-Darqawi is a large text (not just a few pages) which discusses Islam's potential role in freeing Africa from external control and improving the condition of African people. I wouldn't necessarily endorse everything in it. I have my own reservations about the author and some of the positions he adopts. But if you are interested in the subject, it might be worthwhile to at least take a look at what he has to say. But at the same time I would try to think: Are there other ways to understand the situation in Africa? Are there other models for Islam's role in addressing those problems? What are the non-religious factors play in African society? etc.