Post-classical history
Approaches

The historical field of world history, which looks at common themes occurring across multiple cultures and regions, has enjoyed extensive development since the 1980s. However, World History research has tended to focus on early modern globalization (beginning around 1500) and subsequent developments, and views post-classical history as mainly pertaining to Afro-Eurasia. Historians recognize the difficulties of creating a periodization and identifying common themes that include not only this region but also, for example, the Americas, since they had little contact with Afro-Eurasia before the Columbian exchange. Thus researchers around the year 2020 emphasized that "a global history of the period between 500 and 1500 is still wanting" and that "historians have only just begun to embark on a global history of the Middle Ages".

For many regions of the world, there are well established histories. Although medieval studies in Europe tended in the 19th century to focus on creating histories for individual nation-states, much 20th-century research focused, successfully, on creating an integrated history of medieval Europe. The Islamic World likewise has a rich regional historiography, ranging from the 14th-century Ibn Khaldun to the 20th-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. Understanding of communication within sub-Saharan Africa or the Americas is, by contrast, far more limited.

Around the 2010s, therefore, researchers began to explore the possibilities of writing history covering the Old World, where human activities were fairly interconnected, and establish its relationship with other cultural spheres, such as the Americas and Oceania. In the assessment of James Belich, John Darwin, Margret Frenz, and Chris Wickham,

Global history may be boundless, but global historians are not. Global history cannot usefully mean the history of everything, everywhere, all the time. Three approaches seem to us to have real promise. One is global history as the pursuit of significant historical problems across time, space, and specialism. This can sometimes be characterized as 'comparative' history. Another is connectedness, including transnational relationships. The third approach is the study of globalization. Globalization is a term that needs to be rescued from the present, and salvaged for the past. To define it as always encompassing the whole planet is to mistake the current outcome for a very ancient process.

A number of commentators have pointed to the history of the Earth's climate as a useful approach to World History in the Middle Ages, noting that certain climate events had effects on all human populations.
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