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This should be a discussion into what makes an empire-dynasty-state last while others fall and collapse. Much of this discussion revolves around the discrepancy between the lengths of times for Chinese dynastic periods when compared to the same dynastic period for the two later 'Eranshahr' empires, that of the Arsacid and Sassanid. When we compare the history of China, a bureaucratic empire with vast resources, military complexes, strong ideological reasons for their rule and so forth, we see the following trends.

Han Dynasty: 202 BCE-9 CE & 25-220 CE (if we combine two periods, 422 years)
Tang Dynasty: 618-907 CE (289 years of rule)
Song Dynasty: 960-1127 CE and 1127-1279 CE (167 years of rule over the Chinese Empire uncontested or less contested)
Yuan Dynasty: 1271-1368 CE (97 years, we may disregard this example as an intermezzo)
Ming Dynasty: 1368-1644 CE (276 years)
Qing Dynasty: 1643-1912 CE (269 years)

We see with the exception of the Han Dynasty, that the empires of China tended to rule for less than 300 years, and these periods aside from the Yuan->Ming->Qing, led to disunity and subjugation of some sorts and we may say that the fall of the Qing Dynasty, led to this situation for several decades. Despite this situation in China, we find a converse situation in the empires of Eranshahr, the Arsacid and Sassanid.

Arsacid-Parthian Empire 247 BCE-224 CE (475 years of uninterrupted rule)
Sassanid Empire 224-651 CE (427 years of rule, with only a few interruptions)

In the case of these two dynasties, they are certainly, alongside the Ottomans one of the most resilient of all major dynastic powers in human history and further, their states were extremely adaptable. The Arsacid in particular, while hounded on nearly every side of its empire, by the Kushan Empire, the Roman Empire, the wider Armenian problems and so forth, remained relatively consistently self renewing until its demise. Similarly, the Sassanid empire, in its early stages was hyper-aggressive and decimated the Arsacid enemy, the Kushan empire and waged fearsome wars against Rome. In the coming centuries, the Sassanids would face numerous adversity, such as:

The wars with Rome and Byzantium, a foe that few empires have to face.

The Arab issues to the south prior to Islam.

Hepthalite and Turkic invasions and wars from the steppe (the fall of the Sassanid empire nearly occurred due to this).

Internal rebellion over religious issues

Dynastic weakness arising from young emperors and so forth,

Their resilience defies many tropes seen in AH, namely that empires generally have short lifespans, which I generally would prescribe to. Even the dynastic exchanges of China and their interregnums, are a short time period comparatively.

To finalize the topic, what in the opinion of the board, is the key to the creation of an empire-dynasty that is able to be resilient, durable and enigmatic to a degree that we may say is exceptional? Especially in cases where said empire is in a dangerous land, we understand fine that an empire in Japan or an isolated place, may maintain rule, but we coudl say that this is not resilient, not in the same manner. Sassanid resilience entailed defeating numerous crises that in theory, may have broken most human made empires-kingdoms, such as most Chinese dynasties or say the Kushan Empire or even the Ummayyad-Abbasid Caliphates.
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