World history, global history or transnational history (not to be confused with diplomatic or international history) is a field of historical study that emerged as a distinct academic field in the 1980s. It examines history from a global perspective. It is not to be confused with comparative history, which, like world history, deals with the history of multiple cultures and nations, but does not do so on a global scale.
World history looks for common patterns that emerge across all cultures. World historians use a thematic approach, with two major focal points: integration (how processes of world history have drawn people of the world together) and difference (how patterns of world history reveal the diversity of the human experiences).
The advent of world history as a distinct academic field of study can be traced to 1980s, and was heralded by the creation of the World History Association and graduate programs at a handful of universities. Over the next decades scholarly publications, professional and academic organizations, and graduate programs in world history proliferated. World History has often displaced Western Civilization in the required curriculum of American high schools and universities, and is supported by new textbooks with a world history approach.
The study of world history, as distinct from national history, has existed in many world cultures. However, early forms of world history were not truly global, and were limited to only the regions known by the historian.
In Ancient China, Chinese world history, that of China and the surrounding people of East Asia, was based on the dynastic cycle articulated by Sima Qian in circa 100 BC. Sima Qian's model is based on the Mandate of Heaven. Rulers rise when they united China, then are overthrown when a ruling dynasty became corrupt. Each new dynasty begins virtuous and strong, but then decays, provoking the transfer of Heaven's mandate to a new ruler. The test of virtue in a new dynasty is success in being obeyed by China and neighboring barbarians. After 2000 years Sima Qian's model still dominates scholarship, although the dynastic cycle is no longer used for modern Chinese history.