Why is it said that China has been in the same boat through thick and thin for three thousand years?

In 221 BC, Qin Shihuang unified the Qin State, and the idea of ????grand unification came into being, and the idea of ????the unification of the Chinese nation was formed.

Afterwards, the peasants revolted, the new dynasty was established, experienced great waves, the Qin, Han, Yuan, Ming and Qing dynasties, and experienced wars against foreign aggression and the war of liberation.

Until the founding of China, and after the reform and opening up, we have been together through thick and thin, and have gone through thick and thin.

The Communist Party of China has planned for more than three thousand years to determine that China has been in the same boat through thick and thin for three thousand years.