On the other hand, if China fragments earlier under Korean pressure, Vietnam and all of Indochina can shake off their Chinese masters and get earlier independence...
I would really like to know when could Korea gain enough impetus (and manpower and so on) to fragment China... I mean, what could be the intention in the first place? And wasn't that kind of like a pinch of salt wanting to press against a large lake? Besides, I can't see besides a geological POD to grant Korea the ability to press against the whatever river valley civilization developed nearby.
And Chinese vassalage system was described by some as dispensing Chinese wealth to gain "glory" in the name only, at least in peaceful times, so the vassals might have at least tiny bits of "loyalty" developed.
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