1, different development opportunities. Chinese civilization lasted for five thousand years, but its actual development remained in feudal society until the Republic of China. But then there were warlord scuffles, the Kuomintang-Communist War, War of Resistance against Japanese Aggression and the War of Liberation. In fact, the real development was after the founding of People's Republic of China (PRC) in 1949, which was only over 60 years ago. Moreover, development often encounters troubles, such as war, international environmental interference and so on. The United States is different. Since Mayflower landed in America and established many colonies along the coast of America, it has been smooth sailing since it really became independent from Britain. And it was catching up with the development of capitalism all over the world in full swing. Then, after the westward movement of the United States and the Civil War, the national strength was enhanced. Then the industrial revolution basically followed the trend of the times, and later led the information revolution. Natural national strength is strong.
2. Different international status. China's long history does not mean that it has a high international status. In the past, we were a powerful country, only in the Han and Tang Dynasties, but the world entered capitalism, and we were in the decline of feudal society, so that we became a semi-colonial and semi-feudal society. Then there was chaos. Even after the founding of People's Republic of China (PRC), our seat in the United Nations was still occupied by Taiwan Province Province, and it was not until the 1960s and 1970s that it was recovered. Only after the reform and opening up, our economic strength has increased and our international status has improved. The United States, which has developed into the largest country in the world for hundreds of years and experienced World War I and World War II, has gained the most.
3. Different military forces. China has a large population and advanced weapons. But there are many scientists here, and the weapons are the best in the world.
4. Different systems.