After four decades of British rule in colonial Kenya, a previously unknown ethnic name—“Luyia”—appeared on the official census in 1948. The emergence of the Luyia represents a clear case of ethnic “invention.” At the same time, current restrictive theories privileging ethnic homogeneity fail to explain this defiantly diverse ethnic project, which now comprises the second-largest ethnic group in Kenya. In Cartography and the Political Imagination, which encompasses social history, geography,...