WI the black death had moved east?

As we know the black dead began in central asia, close to modern day Kyrgyzstan and moved to europe, but what if instead the black death had moved to Xinjiang, and then to Mainland China, then Burma, Indochina, Manchuria, southeast asia, korea and finally reached japan?
 
China. The Black Death pandemic may have begun in Southern China. At the very least, there were immense epidemics in the early 14th century that amplified the devastation of the mid-century civil wars, although there is some controversy over whether this deadly cocktail included the Black Death. In 1331 90% of the population of Hebei reputedly died (probably an exaggeration) and by 1351, when large rebellions were beginning against the Mongols were blossoming, some historians argue that the majority of Chinese had died from said epidemics. Even if we assume that the Black Death was not among these epidemics (doubtful, in my opinion) the inclusion of the plague would not necessarily have changed much; the 14th century would still have been a century of immense human suffering and political turmoil, almost certainly resulting in the restoration of a native dynasty.

Burma. Burma was spared from the plague for uncertain reasons, despite or because of the fact that the disease was endemic in the border region between China and Burma. However, the 14th century was also an era of turmoil and population decline caused by warfare. In the 1360s to the 1380s, and again in the 1520s and the 1540s, the Shan (people living around what is now the Myanmar-China border) ravaged Upper Burma and sparked crises of mass southwards migration: "The heretic Shans pulverized, ground to pieces, and utterly destroyed the Burma country," says a 1682 inscription. The Black Death would intensify the chaos, especially since it would strike Upper Burma, by far the most densely populated region, the hardest (you could argue that the Black Death would mean 14th-century drought in Burma would not matter; I disagree, drought would still push people downriver and weaken Upper Burma at the expense of coastal, wetter Lower Burma). This means the Shan may well colonize more ethnically Burman territory, if they are lucky enough perhaps even marginalizing Burman polities just as Siam, the descendant of Tai intruders, marginalized Cambodia in the central mainland and as the Burmans themselves replaced Pyus in the 9th century.

Vietnam. Vietnam was also spared the plague, but its population still fell from 2,400,000 in 1340 to 1,600,000 in 1400. This was because of societal instability caused by, among other things, foreign invasion and overpopulation. In 1377 Cham invaders (from Champa, what is now central Vietnam) killed the king of Vietnam and later sacked the capital. In 1389 Vietnamese vagabonds went so far as to occupy the capital itself. The Black Death would have an interesting effect. Overpopulation would be taken care of in the course of a single year, relieving societal tension. Considering that Cham invasions may also have been motivated by population pressures in Champa, Vietnam might actually not have much worse of a 14th century than it did IOTL.

Korea and Japan. I don't pretend to be an expert in Japanese history and my knowledge of Korean history before the 1600s, or social history in general, is limited. But out of the five realms being discussed, the Black Death would likely have the greatest change on Japan. I would not be surprised if the plague was enough to topple central authority in Japan altogether. It is important to remember that the Black Death would arrive in the early North and South Courts period (before the hanzei decree of 1368 and other Ashikaga innovations), when shogunal/imperial authority was tenuous. On the other hand, I think the Koryo dynasty would persevere in Korea for at least a few more decades. The yangban aristocracy was not yet disillusioned enough with the Koryo kings for there to be widespread enough elite support for a dynastic change (as kings for four centuries the Koryo had great legitimacy), while regional strongmen were very weakened by the Mongol conquest of the past century.
 
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