The reason for this is the following：

1. At that time, there were many countries, and the strategy was the survival of the fittest, and the weak were eliminated. It was an era of the law of the jungle.

2. The theme of today's world is peace and development, and the motherland should be reunified (China is preoccupied with the territorial issues of Taiwan Province Province, China and Japan that have not been recovered).

However, social unrest and years of war have brought great damage to productivity and made people miserable.

At that time, it was an era of a hundred schools of thought contending, with splendid culture, the way of governing the country, the way of marching and using troops, and foresight. All kinds of people emerged one after another, including many talented and eloquent counselors and Wu Xie. There are talented national armies and unconscious masters without foresight; .........., a warrior and lobbyist, is the most brilliant peak of China culture.