During the same period, many regimes coexisted. As for the development trend, it should be a long-term combination and a long-term combination.

2. Disagree with the second half of the sentence, that is, "historical stagnation and retrogression", the great integration of all ethnic groups, such as "Ren Hu Han Fu" and "Han Hu Shi" interacting with each other.

To change the unique culture of our nation, in our view, is to betray our ancestors and abandon our own language. Emperor Xiaowen himself made the mistake of ordinary people, that is, changing his surname and changing Tuoba to Yuan. The result of the reform was still successful, and a powerful dynasty was established, from weak to strong, which accelerated the process of ethnic integration in the Yellow River Basin.

The Great Wall is a symbol of ancient civilization. Whenever the Hu people invade the Han people, the Great Wall is our first barrier. If it is broken, there will be the Yellow River and the Yangtze River. These three barriers are our defense lines. Later, Liao occupied sixteen states of Youyun, namely, Beijing, Shanxi and northern Hebei, that is, the Great Wall. Jin people occupied three lines of defense, and so did modern Japan. Therefore, the Great Wall is the first of the three lines of defense and the gateway!

In order to defend Huns, the Great Wall was built. But just after 500 years of war, everything needs to be abandoned, and the productivity is weak, so it is difficult to support large-scale projects, not to mention Epang Palace, Lingqu, Qin Shihuang Mausoleum and so on. People were very miserable during the construction period, as evidenced by Meng Jiangnv's crying for the Great Wall.

6. Since the Eastern Jin Dynasty, the south moved south and became the economic center at that time. Because of its natural advantages and relatively stable society, it promoted the prosperity of southern commerce and cities and reached its peak in the Song Dynasty.

7. Liu Bei entered Sichuan; Sun Quan in the east and Cao Cao in the north; Burning red cliff;

8. For Liu Bei; Correct; No, you can't draw a conclusion!