Of all the ancient cradles of civilization, China is the only one that can claim a more or less uninterrupted cultural continuity from its Blue/Yellow River origin to its current form, with foreign dynasties and invaders largely assimilating into Han Chinese society rather than forcing their culture on the rest of the county - successfully, at least, it's not like the Manchu did not try to do so.
Would've any other ancient civilization been able to survive in such a way? If Egypt hadn't been Arabized, the Copts could've been able to claim a similar history - even though they'd been subject to massive Christian and Hellenic influences, the same can be said about China's adoption of Buddhism. The survival of Indus River Valley and Mesopotamian civilization is harder, since you might have to butterfly the Indo-European expansion away.
Would've any other ancient civilization been able to survive in such a way? If Egypt hadn't been Arabized, the Copts could've been able to claim a similar history - even though they'd been subject to massive Christian and Hellenic influences, the same can be said about China's adoption of Buddhism. The survival of Indus River Valley and Mesopotamian civilization is harder, since you might have to butterfly the Indo-European expansion away.