The thing is, China was eventually reunited and each of those barbarians eventually became Chinese in both identity and culture. Rome, however, went into perpetual decline and what it meant to be Roman shrunk considerably with time becoming more and more inclusive until it was almost a form of pseudo-nationalism for Orthodox Greeks instead of a cultural identity.They pretty much had the same fate. They both fell, to internal disintegration combined with military failure. Both Rome and Han's final end came with a military strongman who forced the last weak emperor to abdicate. Both were immediately followed by a era of confusion and disunity.
Afterwards, the Eastern Roman Empire continued to claim Rome's legacy while keeping at bay eastern Barbarians. Similarly, the Han Dynasty was followed by the Jin, who kept the northern barbarians at bay while the south was allowed to develop.
I don't think Rome had more threats. China was just as threatened during this time. The steppe nomad threat to China was probably just as threatening as the Persian threat to Rome.I believe the big issue is that Rome had multiple threats to face. China only had internal fighting and steppe peoples. Rome had the Germanics, occasionally steppe invasions AND most importantly the Sassanids. Later the Sassanids were replaced by the Caliphate but the relationship was similar. And when the Caliphate broke up politically the Byzantines began to regain territory again until the Seljuks united the Muslims.
Was there another civilization of comparable vitality and prestige (Persians/Persianized Arabs) next to China that could and would snap up territories?
Also in regards to who was "Roman" the elites WERE all Roman as it was considered in the time period.
Presuming that Scholar's description is the intended point of the OP, I think the biggest issue might be geography. The territories of Rome were basically centered around a core in Italy, and geographically divided provinces, which eventually developed into their own independent states. While the divergence of Latin into the Romance languages and Roman culture into Romance cultures is not something I've studied in depth, AFAICS, a big part of the divergence stems from major geographical division. For example, France and Spain developed separately from the the division along the Pyrenees, and sub-Roman Britain developed independently by virtue of the separation of the English Channel.
By contrast, China's biggest advantage in remaining coherently unified is that it's a geographically unified state; where Rome was divided by mountains and sea, China had at best token divisions by river, and was geographically, one unit. Where geography caused divergence in the post-Roman era, geography created a "re-unification" impetus in China.
Too, there is the fact that Rome was not as much of a culturally unified state as China. Whereas China largely had a unitary Chinese culture, there always was a major division in Rome between the Latin-dominated west and the Greek-dominated east.
Also, my understanding is that Rome, even at its height, was a much more de-centralized state than China ever was (excepting in civil wars and such), but that I'm less certain of.
Yes. And the geographic appendage of Han China that WAS separated by China partially by sea and was a peninsula (Korea) remained a separate nation with separate people. As did Nan Yueh (Vietnam), too separate from China to be united by canal, and partially, Llaoning (Southern Manchuria) and the Kansu Corridor and Sinkiang. Which proves your thesis of the importance of geography.
I believe the big issue is that Rome had multiple threats to face. China only had internal fighting and steppe peoples. Rome had the Germanics, occasionally steppe invasions AND most importantly the Sassanids. Later the Sassanids were replaced by the Caliphate but the relationship was similar. And when the Caliphate broke up politically the Byzantines began to regain territory again until the Seljuks united the Muslims.
Was there another civilization of comparable vitality and prestige (Persians/Persianized Arabs) next to China that could and would snap up territories?
I don't think Rome had more threats. China was just as threatened during this time. The steppe nomad threat to China was probably just as threatening as the Persian threat to Rome.
There weren't other civilizations that could and would snap up Chinese territories, but there were certainly other powerful countries surrounding China. I would say that the Gokturk and Tibetan empires surrounding China were the most militarily threatening. In 626, one Turkish Khan and his army approached within 30 kilos of the Tang capital, forcing the Emperor to come out and submit. Luckily for the Tang, the Gokturks got devastated by a frost a few years later, allowing the Tang to regroup and destroy them. After 755, the Tang western territories were lost to the Tibetans and Uighurs. In 763, Tibetans seized the Tang capital before being forced back. The Uighurs later were probably more militarily powerful than the Tang Empire. Historically, the Gokturks and Uighurs were less interested in acquiring territory, unlike the Tibetans who were hungry for territory, but in an alternate scenario, they might not be. There was also Koguryŏ and Parhae in China's northeast, but while these two states (I hesitate to say that they constitute a pre-existing Korean civilization) could definitely expand into Chinese territory, they don't pose the existential threat that the Tibetans and Turks pose to China.
If you want to reverse Rome and China, perhaps the best strategy would be a breakup of the Persian empire followed by more expansionist steppe nomads in China.
Challenge: Switch the fates of the Roman Empire and Han China.
One follows from the other but it's not required. That is, Rome was always required to keep an enormous part of its army on the border with the Sassanids compared to the Parthians and this sucked up manpower and funds. This wasn't beyond the empire's capabilities, but it meant that they had much less margin for error. When error came, the Persian/Islamic civilization was there, culturally distinct, to expand it's influence and snap up territory.These points are unrelated to each other. Both Rome and China faced significant challenges from outsiders for centuries, but although China clashed with other powerful entities, none of them were significant enough to influence other far-flung regions culturally as well, similar to what China had done. In contrast, the Persians as a whole continued to influence disparate entities outside of its core territories, and remained culturally distinct from its neighbors, even after the Arabs eventually conquered them.
No way to make the Romanization process quicker and more efficient?I am afraid these fates could not be switched.
The Roman civilization was extremely bright but it was less resistant than the Chinese civilization.
The Barbarians who conquered the Chinese territories became more and more Chinese with every passing generation. In the end most of the conquerors became truly Chinese in culture, language, customs and most often in self-identity as well.
The Barbarians who conquered the Roman territories stayed the Goths, the Vandals, the Sueves, the Franks, the Burgundians and so forth and had little inclinations to identify themselves as the Romans.
And more than that - our sources say that though the elites of the Goths got Romanized to some extent the overwhelming majority of the Italian Romans - the Roman commoners imitated the Gothic common people, their ways, their habits, customs, their culture.
I am afraid the same process of the common Roman folks imitating Barbarian ways took place in Gaul, Spain and in other conquered Roman lands.
So after a few centuries after being conquered the Romans forget that they were Romans. Their local identities and loyalties prevailed.
Of course the Barbarians who conquered the Roman territories changed themselves. But it was a process of creating new identities; it was amalgamation. It was never a process of 'Barbarians becoming Romans' like it was often the case in China - 'Barbarians becoming Chinese'.