For many regions of the world, there are well established histories. Although Medieval Studies in Europe tended in the nineteenth century to focus on creating histories for individual nation-states, much twentieth-century research focused, successfully, on creating an integrated history of medieval Europe. The Islamic World likewise has a rich regional historiography, ranging from the fourteenth-century Ibn Khaldun to the twentieth-century Marshall Hodgson and beyond. Correspondingly, research into the network of commercial hubs which enabled goods and ideas to move between China in the East and the Atlantic islands in the West—which can be called the early history of globalization—is fairly advanced; one key historian in this field is Janet Abu-Lughod.