I feel that the dynasty with the greatest external influence was the Qin Dynasty, because the Qin Dynasty unified the whole country, established a new centralized regime through various reforms of imperial official system and local counties, and made the first real empire in China history. Because of the special dispersion before, it was unified in the Qin Dynasty. Then, the words were unified, which made the whole country form a unified situation. The influence of the Qin Dynasty mainly laid the foundation for the reunification of China, so that even if there was chaos in the world, it would not be dispersed and eventually returned to the origin of reunification, which was the contribution of the Qin Dynasty.

Followed by the Han Dynasty, the contribution of the Han Dynasty was to let the country recuperate and spend enough time on the cornerstone of the Qin Dynasty to consolidate the unified situation, let Emperor Wu of the Han Dynasty communicate with the western regions with his army, and let the people be proud of being a great man. The greatest influence of the Han Dynasty was to consolidate the unified imperial power, make up for the defects of the unified imperial power in the Qin Dynasty, and make the unified situation more perfect.

Then the Sui Dynasty. After the death of the two emperors, there was no commendable literary martial arts, but this small dynasty actually created a civilized imperial examination system. Before the Sui Dynasty, aristocratic families monopolized state affairs, and Emperor Wen promoted the common people's poverty through the imperial examination system, with the aim of weakening the hereditary privileges of aristocratic families. The greatest influence of the Sui Dynasty was that the implementation of the imperial examination system had a far-reaching impact on later generations and revived national vitality. Expand China's peripheral influence through its powerful national strength.

From these dynasties, we can see that the Qin Dynasty was the most influential in China's history, because the Qin Dynasty broke through the original regime structure with incomparable creativity and laid the embryonic form of a unified empire. Without the cornerstone of the imperial power in the Qin Dynasty, there might be no later Han and Tang Dynasties, so China will soon be shattered.