Before the European conquest of almost all of Africa in the late 19th century, the continent was home to many different states. Some noteworthy ones include:
- The Sultanate of Zanzibar, which ruled over the coast of what is now Tanzania and Kenya at its height and had vassals further inland. Its economy was highly dependent on slavery, and the country was eventually partitioned between Britain and Germany;
- The Ashanti Empire, located in what is now Ghana. It clashed with Britain as early as the 1820s, and was eventually conquered in 1900. Could they inflict a conclusive defeat on the British during their first war, allowing the empire to keep control of its coastline?
- The Sokoto Caliphate, which existed in what is now northern Nigeria, Cameroon, Niger and Burkina Faso. This was probably the biggest and most populous African state at the time of its existence, with a population of 30 million people. It was, from what little I've read about it so far, highly unstable as well.
- The Toucouleur Empire, the youngest and shortest-lived of all the states on this list. Founded by Omar Tall on 1861, it was, according to its wikipedia article, plagued by infighting between Omar's relatives in the years that followed his death, and was conquered by the France in 1893.