In order to maintain Manchu rule, the Qing dynasty restricted the Han people from acquiring military and advanced technology and closed the country to the outside world. Although the economy has developed, when the wave of world industrial revolution rose, it was out of touch with the development of the world and indulged in the riding and shooting advantages of nomadic people without introspection;

Although the economic aggregate of the Great Qing Dynasty accounts for two-thirds of the world's total, a British army of 5,000 to 6,000 people can invade the capital Beijing, grovel, cede land for compensation, cruelly squeeze it at home, and ban the idea of pestle.

The peak of China's feudal dynasty was the Song Dynasty, not the Tang Dynasty.

Song Dynasty is the dynasty with the most prosperous economy, the most advanced science and technology, the most prosperous culture, the deepest art and the richest people's living standard in the history of China. It was the dynasty that won the most glory for China, and it was also the country with the most inventions and creations in the world at that time.

The Song Dynasty was also the period when China made the greatest contribution to the world. More than half of the important inventions in China's history appeared in the Song Dynasty. At that time, three of China's so-called four great inventions began to be applied on a large scale, such as gunpowder, needlepoint, printing, paper money, vertical textile and important reforms in porcelain-making technology.

In the Song Dynasty, navigation, shipbuilding, medicine, technology and agricultural technology all reached unprecedented and unparalleled heights in ancient times. The Song Dynasty also developed a new science-technical science, and these brilliant achievements are directly related to the comprehensive civilization of the Song Dynasty.