أمير المؤمنين
Developed in the context of multiple independent Hausa Kingdoms, at its height, the caliphate linked over 30 different emirates and over 10 million people in the most powerful state in the region and one of the most significant empires in Africa in the nineteenth century. The caliphate was a loose confederation of emirates that recognized the suzerainty of the Amir al-Mu'minin, the Sultan of Sokoto. The caliphate brought decades of economic growth throughout the region. An estimated 1-2.5 million non-Muslim slaves were captured during the Fulani War. Slaves provided labor for plantations and were provided an opportunity to become Muslims.