Book excerpt: Introduction -- The Age of revolutions and the Atlantic World -- The origins of jihād in West Africa -- The jihād of Ô̂uthman dan Fodio in the central Bilād al-Sūdān -- The economic impact of jihād in West Africa -- Jihād and the slave trade -- The repercussions of jihād in the Americas -- Sokoto, the jihād states, and the abolition of the Atlantic slave trade -- Empowering history : trajectories across the cultural and religious divide -- Appendix: Population estimates for the Sokoto caliphate, ca. 1905/15