In recent decades historians specializing in the Middle East and North Africa have studied endemic and epidemic diseases as well as evolving medical and public health knowledge and policy to better understand major historical transformations. The study of gender and empire, class and ethnicity, and civil society and government in the determination of medical and public health policy has yielded new insights into questions of state power, colonialism, imperialism, nationalism, modernity, and globalization. Historians have asked why, when, and how Western medicine took root in Muslim societies, which had their own complex and longstanding medical traditions.