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Here's the challenge and the plausibility check, have the Persian empire of Cyrus turn into a southwest Asia "eternal empire" like China.

Can dynasties be toppled and replaced by invaders? Sure.

Can the realm be divided into warring states for periods lasting over a century at times? Yes

But must giant Persia be an eternal "thing" that reestablishes unified control over at least Iran, Afghanistan, Pakistan, Mesopotomia, the Levant and a majority of Anatolia, except for interruptions of at most 2 centuries? Yes-


Different but parallel idea:

Have India be under a unified state more often than not (like China) for at least the last two millenia.
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