Which of the following events did not cause a large number of people from the Central Plains to migrate to the south of the Yangtze River?

Choose D. The first time was the Qin Dynasty. This immigration kicked off the development of the south.

After destroying the six kingdoms, the talented Qin Shihuang continued to send troops to the south, conquered the Yue areas, and reached the South China Sea, where he established counties and counties. For the first time in history, he controlled the Pearl River. The basin has implemented effective governance. In order to strengthen the management of this area, Qin Shihuang also migrated 500,000 Central Plains people to these areas to mix with the Yue people. Iron tools and advanced production technologies from the Central Plains were subsequently introduced to the Pearl River Basin. These measures promoted the development of local production. However, this migration was a subjective act by the government. Coupled with the tyranny and rapid demise of the Qin Dynasty, it did not have a great impact on the southern economy.

The second time was during the Three Kingdoms, Jin and Southern and Northern Dynasties. This immigration promoted the great development of the southern economy.

At the end of the Eastern Han Dynasty, the warlords in the Central Plains region were engaged in melee warfare, which was a mess. "White bones were exposed in the wild, and there were no roosters crowing for thousands of miles." This was a true portrayal of northern China at that time. The Jiangnan area was relatively stable. Therefore, a large number of people from the north moved south. Between 313 and 450 AD, the number of people who migrated from the north to the south reached 900,000, accounting for 1/7 of the original household registration in the north. In fact, this statistic has been greatly reduced due to the hidden loss of household registration during the period of displacement and chaos. As someone has already pointed out: "Since the Central Plains has been in chaos, people have left their own territory, Jiangsu has been created, powerful families have merged, or guest houses have been displaced, and the nationality has not been established." "At that time, the people were in trouble, and they were displaced from this area, and most of the refugees took shelter. As a guest.” This shows that the actual scale of immigration is far higher than the above official statistics. During this period, the distribution of immigrants was still mainly in the Yangtze River Basin, and there were also many immigrants from Fujian and Guangxi further south. According to records: "In the second year of Yongjia in the Jin Dynasty, Zhongzhou was in chaos, and the eight ethnic groups who first entered Fujian in clothes and clothes were called Lin, Huang, Chen, Zheng, Zhan, Qiu, He and Hu are also. "The waves of immigrants from the north brought advanced technology and labor force to the south, providing favorable conditions for the further development of the south. It also laid the foundation for the historic shift of China's economic and population center of gravity from north to south.

The Wu State of the Three Kingdoms was committed to the development of the south. The people who moved south and the local Shanyue people jointly developed the Jiangnan area. By the late Three Kingdoms period, the economy of Jiangnan had developed greatly. "Three Kingdoms. Lu Xun's Biography" records: Jiangnan area "doubles the fat and fat, the national tax is the reripened rice, and the local tribute is eight silkworms' cotton." With the development of the economy, the power of aristocratic families also grew, which had a great impact on China's political situation from the 4th to 6th centuries. Beginning in the late Western Jin Dynasty, the north was once again in chaos. First there were disputes among the Sixteen Kingdoms, and then there were constant changes in the Northern Dynasties. The people of all ethnic groups in the north were brutally ruled by minority nobles. As a result, people from the north moved south in large numbers, bringing with them the latest technology in northern agriculture and filling the workforce that the south desperately needed at that time.

The southern government initially adopted the policy of setting up prefectures and counties for the people coming from the north. Later, in order to expand the scope of exploitation, the rulers implemented the policy of "difficulty", that is, the household registrations of northern refugees and local residents were Grouped together, both southerners and northerners had to bear the country's taxes and corvees. This effectively recognized the legal status of northern immigrants.

Thanks to the joint efforts of the people of all ethnic groups in the north and south, the southern economy has developed rapidly. "Song Shu" records: Gusu "fertile fields and beautiful soil, with acres of land facing each other, even the sky is high." "The streets are like embroidery"; Yangzhou "has a vast land and abundant fields, and the people are diligent in their own business. If they harvest crops in one year, they will forget about hunger in several years." The financial revenue of the Eastern Jin Dynasty was mainly provided by the Sanwu (Wujun, Wuxing, and Kuaiji) regions.

In the process of further development in the south, people of all ethnic groups communicated closely and learned from each other, promoting ethnic integration. As a result, the economy of Jiangnan, which had always been backward, gradually caught up with the level of the north, and the situation of poverty in the south and wealth in the north began to reverse. Because of this, after the Sui Dynasty destroyed the Chen Dynasty and unified the north and the south, it was necessary to build the Grand Canal to connect the economies of the north and the south. On this basis, the feudal economy of the two major river basins of the Yellow River and the Yangtze River went hand in hand, making social productivity nationwide universal. Development, in this way, gave birth to a more powerful feudal dynasty than the Han Dynasty - the Tang Dynasty. However, at this time, the economic strength of the south still did not exceed that of the north, and the north was still the most economically developed region in China.

The third time was during the Southern Song Dynasty. This immigration made the southern economy completely surpass that of the north.

After the Song Dynasty moved south, the Jin regime ruled the Yellow River Basin. The people in the north once again suffered from the pain of war. Coupled with the orthodox mentality of supporting Zhao and promoting the Song Dynasty, people moved south one after another. According to records, in 1159 At that time, the population of the South was 16.84 million. By 1179, the population reached more than 29.5 million. In just twenty years, the population increased by three-quarters. The migration of a large number of people from the north to the south has greatly promoted the social development of the south. Many civil servants and generals in the Southern Song Dynasty also came from the north, including Yue Fei, Han Shizhong, Zhang Jun, etc.; among civilians, there were also many famous figures who went south, such as Li Qingzhao, Xin Qiji, etc. In the following more than 100 years, the people of the north and the south worked together to further develop the southern economy.

Agriculture has experienced greater development. "Suhu is ripe and the world is full of it." Cotton began to be planted in large quantities in the south, the area of ??terraced fields expanded, and farming techniques were greatly improved.

The handicraft industry developed further. The cotton textile industry emerged, and shipbuilding technology improved significantly. Sea-going ships had greater wind resistance and were equipped with compasses.

Overseas trade flourished.

It has three major ports: Quanzhou, Guangzhou, and Mingzhou. Its overseas trade reaches North Korea and Japan in the east and some African countries in the west.

On the basis of the development of agriculture, handicraft industry and commerce, the commodity economy developed.

At this time, the southward shift of our country’s economic center of gravity was finally completed. Since then, the economy of southern China has surpassed that of the north, until now.