Chinese Historical Conjecture - "The Great Reincarnation"

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"The great trend of the world will be divided for a long time, and the division will be united for a long time", the opening words of the Three Kingdoms express the magical law implied in the changes of history in the twists and turns.

The history of civilization in ancient China for more than 5,000 years, from the ancient times of the Three Emperors and Five Emperors to the late Ming and early Qing dynasties, how many unknown but real magic existed in the meantime.

This article is called "Great Reincarnation", which is also called reincarnation, reincarnation, reincarnation, and reincarnation, which means that all beings live and die, and after death, the soul reincarnates again as another person, rotating like a wheel, and the cycle is endless. This article does not talk about life and death, only about historical similarities.

In the eastern weekend, the nations were in strife, and Qin rose from the western region and then destroyed the Seven Kingdoms and dominated the world. However, only more than ten years later, the Great Qin Empire that dominated the world suddenly collapsed, and the world was all returned to the Han after the Chu-Han war, creating a Great Han Dynasty that was recorded in history.

Hundreds of years later, at the end of the Eastern Han Dynasty, eunuchs came to power, foreign relatives were arbitrary, first there was Dong Situ, then Cao ChengXiang, the Han Dynasty and the three states, and then there were Jin and Southern and Northern Dynasties, Sui Wendi was called emperor by Zen, ending the division between the north and the south, and the country was reunified, but only 38 years later, the Sui Dynasty, which was once in great prosperity, completely collapsed, and the Tang Dynasty achieved unification after the great chaos of the world, enjoying 289 years of national unity.

From this, we wonder why after the great unification of the dynasty will experience hundreds of years of nominal demise and frequent wars.

Why did qin and Sui, who unified the world and subdued the nations, die in a short life?

Why were the Han and Tang dynasties able to dominate for a hundred years?

Is this a coincidence or a "great reincarnation" that implies regularity?