Compare material 1 with material 2, and talk about what happened to the economic center of gravity in ancient China.

The economic center of gravity moved south.

(1) The economic center of ancient China shifted from north to south, from the Yellow River basin to the Yangtze River basin and Jiangnan area, and from the mainland to the southeast coast.

(2) The trend of China's ancient economic center moving southward is often the most prominent in the period of national division or feudal separatist wars (such as Wei, Jin, Southern and Northern Dynasties, Anshi Rebellion, Five Dynasties and Ten Kingdoms, Song and Jin confrontation, etc.). ).

(3) The relocation of the ancient economic center of China to the south and the economic development in the south were completed under the conditions of war in the north and relative stability in the south, which shows that political stability is the premise and foundation of social and economic development, and the war and turbulent social environment can only destroy the social productive forces and the achievements of economic development.

(4) Due to the war, a large number of northerners moved south in ancient times, which increased the labor force in the south and brought advanced production tools and technologies to the south, reflecting the highest level of social productivity development at that time. This shows that the hard work and productivity progress of people of all ethnic groups are the most important factors for economic development, and the introduction and application of the most advanced production technology is an important guarantee for promoting rapid economic development.

⑤ The rulers' attention to economic development is also an important factor of social and economic development, which must be paid attention to by the rulers.

⑥ The southward movement of political center has certain influence on the southward movement of economic center, such as Jiankang, the capital of Southern Dynasties, and Hangzhou, the capital of Southern Song Dynasty, which has certain influence on Jiangsu and Zhejiang becoming the national economic center.

⑦ The shift of economic center of gravity to the south is the inevitable result of the dialectical development of the natural environment and the whole social productive forces in the long historical changes, and the natural environment has a great influence on economic development. At present, in the process of developing the western part of the motherland, we should pay attention to the coordinated development of economic development and ecological balance protection and unswervingly follow the road of sustainable development.