In what fields did Qin Shihuang unify the six countries?

During the Xia, Shang and Zhou Dynasties, the territory of China was not large. The territory of the Xia Dynasty is about today's Henan, Shandong, Shanxi, Hebei, Hubei and other places. The territory of Shang Dynasty was roughly the same. The territory of the Zhou Dynasty is the largest, reaching Liaodong Peninsula in the northeast, southwestern Shaanxi in the northwest and Yangtze River basin in the south.

After Qin Shihuang unified the six countries, he did not stop the pace of opening up the territory.

First, Qin Shihuang sent Guo Wei Tusui to lead 500,000 troops south to conquer Lingnan. Lingnan is the place where Baiyue people lived in ancient times. It is called Baiyuedi, which is equivalent to the whole Guangdong, Guangxi and Hainan provinces, and the Red River Delta in Vietnam, covering an area of about 500,000 square kilometers. However, Tu Youyou's military action was not successful. Qin Shihuang immediately sent Ren Tao and Zhao Tuo to attack Lingnan with a great army. After four years of bloody fighting, Lingnan area was finally included in the territory of the Qin Dynasty.

Qin Shihuang set up Guilin County, Nanhai County and Xiang County in Lingnan, and constantly immigrated to Lingnan. These immigrants from the Central Plains brought advanced culture, agriculture and handicraft technology, which greatly developed the economy, society and culture of Lingnan area, which was relatively closed and backward at that time, and gradually kept pace with the Central Plains.

While Qin Shihuang expanded his territory to the south and north, he also opened the Wuchi Road between the Central Plains and the Southwest, which made the Southwest and the Central Plains closely linked.

If Qin Shihuang realized the unification of national political system with the system of "three publics and nine nobles" and the system of counties and counties, then he also realized the unification of economic system and ideological culture with the same book, the same train and unified measurement.

Cars are on the same track-during the Spring and Autumn Period and the Warring States Period, the width of roads between vassal states is different, and the size of wagons is also different. After the reunification of the country, this phenomenon has seriously affected the traffic between places and restricted the economic development. Qin Shihuang ordered the construction of three equator centered on Xianyang, one to the east, one to the south and one to the north, which is equivalent to the current national highway. The track in the driveway is 6 feet wide. At the same time, the distance between the two wheels on the carriage will be changed to 6 feet, which is the same as the track on the chidao. In this way, it is beneficial to the long-distance transportation of carriages.

Unified measurement-During the Spring and Autumn Period and the Warring States Period, different countries had different weights and measures, which easily caused confusion. Qin Shihuang practiced unified measurement. In addition to books with the same language and cars on the same track, he also made unified coins, length units, unit of volume and weight units.

Fourth, the construction of Lingqu.

Lingqu is one of the oldest canals in the world and a great water conservancy project-but it is the product of military action.