John M. Willis revisits state formation and religious reform in Yemen during a period of imperialism, transition, and crisis (1857--1934). He focuses specifically on the British Aden Protectorate, which carved a series of "native states" out of Yemen's southern territory based on the princely India model; and the Zaydi-Shiite Imamate of the Hamid al-Din family, which established a hybrid state in the north that combined elements of the Ottoman state...