China

China is the name given to a vast region in southeast Asia. Although its borders varied throughout its history, it typically followed the borders of the old Han Empire, with the Gobi Desert to its north, Tibet to its west, the Yunan River and the Nanxi River to its south and the China Sea to its east, with a small strip of land just to the north of Tibet that stretched to the Takla Makan Desert. At various times, this territory oscillated between being consolidated under a single ruler and being divided into several different states.
The last time China was unified was in 1680, when the Ming dynasty gave way to Manchurian usurpers who had undermined the dynasty for almost a century. The Manchurians were never able to consolidate their rule over China as they were seen as hostile invaders, with Manchurian influence over Chinese affairs ended with the revival of the Jin Empire and the Japanese Empire, the latter taking over Manchuria for good in the late 18th century. The Jin made several attempts to take over the south of China- which came under the rule of the revitalized Song Empire- but the two states could never overcome their differences. These differences were often spurred by Japan, who kept China divided so that it could eventually take it over, which it did as the 19th and 20th centuries progressed.
The collapse of the Japanese Empire in the early 1950s brought forth many different factions seeking to reunite China, including a third revival of the Jin in the north of China. Reunification dreams were short-lived when the Soviets destroyed the Jin Empire in the late 1960s after a failed Communist revolution, with the revived Mongol Khanate taking over from the Soviets in 1991. Since then, warring factions in the south and meddling by the Mongols have prevented a united Chinese nationalist movement from emerging.