In 238 BC, the King of Qin eliminated the Prime Minister Lv Buwei and the Chang Xin Hou Lao Ai Group, and began to take power. With the help of Li Si and Liao Wei, the King of Qin formulated the strategy of "destroying the princes, claiming the emperor and unifying the whole country". Specific measures are: win over Yan Qi, stabilize Wei Chu and eliminate Zhao Han; Outward attack, one by one.
From the attack on Korea in 230 BC to the extermination of Qi in 22 1 year, * * * forget it 10 year, Korea, Zhao, Wei, Chu, Yan and Qi were successively wiped out, ending the 500-year feudal dispute in China since the Spring and Autumn Period and establishing the first centralized monarchy in China history, namely the Qin Dynasty.
After Qin Shihuang unified the six countries, he began to explore the south in 2 19 BC, which was called "the battle of Qin attacking Baiyue" in history, and it was the most difficult and intense battle in the Qin Dynasty's unification war. According to "Huainanzi Human Training", Qin Shihuang sent "defending the soil to raise 500,000 troops in the Fifth Army ... Three years later, he could not understand the armor and crossbows, which made the supervisor unable to pay; He also used a pawn to cut off the canal and open the route for providing foodstuff, in order to fight the Vietnamese and kill Xi Oujun to translate Vae; Vietnamese people go into the jungle with wild animals. They don't want to be Lu Qin. They think Jie Jun will be a general. But attack the Qin people at night, chop them, kill the commandant and slaughter them, and there are hundreds of thousands of corpses, so be prepared. "
In the process of reunification, Qin sent hundreds of thousands of mainland people south to defend, and brought the advanced production technology and tools of the Central Plains to the south, which promoted the local development. At the same time, roads were built, especially canals were dug to connect the Yangtze River system with the Pearl River system, which played an important role in the economic and cultural exchanges between the Central Plains and the south and southwest.
After the war against Xiongnu and Baiyue, the territory of Qin was unprecedentedly vast, stretching to the sea in the east and Lintao in the west, becoming the largest country in the world at that time.