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Here's the rough idea -- Temujin dies from his neck wound in 1201, leading Jamukha to (much more loosely) unite the "Mongols" under his rule; about a decade later, the Jin Dynasty is successful in making the tribes "submit" (primarily paying miniscule tribute). Meanwhile, the Song re-establish "dominance" in Vietnam.

Later in the 13th Century, the Jin conquer the Goryeo, and in the early 14th finally subdue the Song, along with the Kingdom of Dali -- only to see plague break out in the 1330's (as it did under the Yuan in OTL). Along with several bloody civil wars, this leads their entire dynasty to collapse roughly mid-century, replaced by a new dynasty founded by a Chinese peasant -- who's Empire now encompasses not only OTL East China, but also the Korean peninsula, OTL Mongolia, parts of Siberia, and Vietnam.

So, short question -- given the PoD, is this chain of events plausible?
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