There was chaos in the world at the end of Qin Dynasty. After Liu Bang overthrew the Qin Dynasty, he was named Hanwang. In 202 BC, after the victory of the Chu-Han dispute, he proclaimed himself emperor and established the Han Dynasty, known as the Western Han Dynasty in history. Its capital is Chang 'an. Emperor Wen of Han and Emperor Jing of Han carried out the national recuperation policy and founded "cultural landscape governance"; After Emperor Wu of the Han Dynasty ascended the throne, he opened up the Silk Road, expanded his territory and realized the "prosperity of Hanwu"; By the time of Emperor Xuan Di, the national strength reached its peak. In 8 AD, at the end of the Western Han Dynasty, Wang Mang abolished the emperor and made Chang 'an his capital, which was called the New Dynasty in history and the Western Han Dynasty perished.
In AD 25, after Liu Xiu unified the world, he still took Han as his country name, which was called the Eastern Han Dynasty in history. With Luoyang as its capital, after unifying the world, it was called "Guangxu Zhongxing" in history. Emperor Hanming followed the frivolous and thin fu, and created the "rule of Zhang Ming"; After the Han and Emperor succeeded to the throne, they broke the northern Xiongnu and recovered the western regions, creating an "eternal prosperity", and the national strength of the Eastern Han Dynasty reached its peak. The Yellow Scarf Uprising broke out in A.D. 184, which quelled civil strife but led to local self-respect. After Dong Zhuo's rebellion, the Eastern Han Dynasty existed in name only. In 220 AD, Cao Pi usurped the Han Dynasty, the Eastern Han Dynasty perished, and China entered the Three Kingdoms period.
The Han Dynasty and the Peace Treaty were listed as advanced civilizations and powerful empires in the world at that time. During the Han Dynasty, the scope of the Han Dynasty was established. At its peak, it was bordered by North Korea in the east, Vietnam in the south, Qinling in the west and Gobi in the north, covering a land area of about 6.09 million square kilometers. In AD 2, the population of the Western Han Dynasty reached more than 60 million, accounting for one third of the world at that time.
The Chinese nation has been called the Han nationality since the Han Dynasty, which also made great achievements in the field of science and technology. For example, Cai Lun improved papermaking and became one of the four great inventions in China. Zhang Heng invented the seismograph and the armillary sphere.