sentences:  This resulted in a native uprising, the Abushiri Revolt, which was crushed by a joint Anglo-German naval operation which heralded the end of Zanzibar's influence on the mainland.With the signing of the Heligoland-Zanzibar Treaty between the United Kingdom and the German Empire in 1890, Zanzibar itself became a British protectorate.In August 1896, following the death of Sultan Hamad bin Thuwaini, Britain and Zanzibar fought a 38-minute war, the shortest in recorded history.