2. The world was in chaos 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, Liu Bang proclaimed himself emperor and established the Han Dynasty, with Chang 'an as its capital. It is said that the Emperor of the Western Han Dynasty and Emperor Jing of the Han Dynasty carried out the national recuperation policy and created "the rule of cultural scenery". After Emperor Wu of the Han Dynasty ascended the throne, he promoted kindness, respected Confucianism alone and strengthened centralization. Zhang Qian was sent to the western regions to communicate with the countries in the western regions, open up the Silk Road, expand the territory and realize the "prosperity of Hanwu"; When Emperor Wu of the Han Dynasty proclaimed the Emperor, the national strength reached its peak, and the western regions were formally incorporated into the territory, which was called "filial piety" in history. 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.
3. In AD 25, Liu Xiu, a descendant of the imperial clan of the Han Dynasty, unified the world and restored the Han Dynasty. After that, Han was still the country name, and Luoyang was its capital, which was called the Eastern Han Dynasty in history. After Liu Xiu unified the world, he defeated the enemy without fighting, which was called "Guangxu Zhongxing" in history. Emperor Hanming followed the frivolous and thin fu and launched the "governance" movement, and the national strength reached its peak in the Eastern Han Dynasty. After the Han and Emperor succeeded to the throne, they broke the northern Xiongnu and recovered the western regions, creating a "prosperous age through the ages", and their national strength reached its peak in the Eastern Han Dynasty. The Yellow Scarf Uprising broke out in A.D. 184. Although the civil strife was quelled, it led to local self-respect. Dong Zhuo moved to Chang 'an in A.D. 19 1 year. In 220 AD, Cao Pi usurped the Han Dynasty, the Eastern Han Dynasty perished, and China entered the Three Kingdoms period.
The European Roman Empire during the Han Dynasty and the Peace Treaty was listed as the most advanced civilization and powerful empire in the world at that time. In the heyday of the Han Dynasty, it was bordered by Korea in the east, Vietnam in the south, Qingling in the west and Gobi in the north, with a land area of about 6.09 million square kilometers.
5. Since the Han Dynasty, Huaxia nationality has been called Han nationality gradually, and the Han Dynasty has 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.