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In OTL, from the founding of China under the Qin Dynasty from 221 BC to the present, China has existed. It's expanded over time and it's had many non-native dynasties (Khitans, Jurchens, Mongols, Manchu), but it has always been China.

How plausible is it that the world could be dominated by classic, unitary cultures? That is, let's say the Romans successfully Romanize the entirety of the Empire at least linguistically, much as the Han people did to the people they absorbed south of the Yangtze.

Is it possible that the Roman Empire, the Persian Empire and some sort of Hindi/Aryan dominated Indian equivalent could be maintained throughout history, much as with China? That is, even if the ruling ethnicity changed with different dynasties and conquerors, they always adopt the culture, language etc.

To an extent this is true with Persia anyway - but I'm more interested in having a Persia that's reminiscent of the old Persian Empires as well.

TL;DR: Create the most plausible scenario in which Persia, India, Rome and China are superpowers/regional superpowers throughout history, as China has been OTL.

Bonus points if a minimal number of independent entities exist between them.

What other nations are potential candidates? Mali/Ghana? Incas?
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