During the Xia Dynasty, China's land was very narrow, and most Xia people only lived in the present Central Plains. That is, part of the land in Henan Province. At that time, people's lives were very backward, and they basically did not get rid of the habits of primitive society. So their contribution to the territory of China is also very small. Can be ignored.
The Qin Dynasty was a country that truly unified China. Xia, Shang and Zhou dynasties were enfeoffment, and the country was a scattered tribal alliance. There is no ability to act in unison. It took Qin Shihuang and his ancestors a long time to reunite China.
At that time, the territory of the Qin dynasty was already very large, and the East China Sea could be reached eastward. To the west, you can reach the present Qinghai province, and to the north, you can reach the present Inner Mongolia grassland. To the south, it has reached the present Guangdong and Guangxi regions. The territory of Qin Dynasty laid by Qin Shihuang is the basic plate for the expansion of Chinese empire in later generations, and it is also a local area of China.
It's a pity that the death of Qin Ershi restored the nobles of the six countries. China, which was unified by Qin Shihuang, once again fell into a separatist situation. The original good situation is gone forever, all because Qin Shihuang was too kind to the nobles of the previous dynasty. Although the Qin Dynasty established by Qin Shihuang has passed away, Qin Shihuang's great cause and idea of unifying China have been deeply rooted in people's hearts and have been inherited and carried forward by the rulers of the Han Dynasty.
When the Ming dynasty was about to perish, most of the land had been lost, leaving only the same basic disk as the Qin Shihuang period. You know, the rulers of the Ming Dynasty once said that they were far ahead of the Han and Tang Dynasties. However, the land of the Ming Dynasty was only over 3 million square kilometers, which was nothing compared with the demise of the Han Dynasty and the Tang Dynasty in history. More than 0/000 years have passed since the Qin Shihuang period, and the territory of the Ming Dynasty has shrunk to this extent, which is simply an insult to the state system.
It is a mess for the Qing Dynasty to inherit what the Ming Dynasty inherited. At that time, the emperor shunzhi in the Qing Dynasty had just entered the Central Plains, and there were remnants of the Ming Dynasty in the south, continuing to resist their resistance. From a certain point of view, it does hinder the pace of reunification. Later, Emperor Kangxi truly unified the world. He destroyed Wu Sangui's rebellion in the south and Gerdan's disobedience in the north. It was from the descendants of Zheng Chenggong that Taiwan Province Province was returned to the Qing Dynasty, and China re-entered an era of unity and prosperity.
If Emperor Kangxi really wants to rank among the emperors in China's history, he will definitely be in the top three. His contribution to the territory of China is also unique in history. During the reign of Emperor Kangxi, the Qing Dynasty entered its heyday, stretching from the East China Sea to Lake Baikal and Siberia in the north. To the west, the Qing dynasty has completely recovered the western regions of Khufu and Balkhash Lake during the Han Dynasty. In the south, the Qing Dynasty completely owned the whole South China Sea and Hainan Island. Countries all over East Asia must submit to the Qing Dynasty.
The Qing Dynasty was the country that made the greatest contribution to the territory of China in the history of China. It conquered the lost areas of China in the past with its own cavalry and force, bringing the territory of China to a perfect state. This is also the historical basis for our Chinese descendants to lay the territorial principle.