I think it makes sense to summarize some differences between U.S. and China, because the two countries and cultures do differ greatly in many aspects. Since I don't think I can tell the political, or economic, or cultral differences between the two professionally enough, so I just say something about the daily life.
Commonly, American car drivers obey the traffic regulations more strictly than most Chinese car drivers do, which may due to the more perfect laws and regulations in U.S. That cars let the pedestrians go first can be usually seen here, while now in China, cars are much stronger and more powerful than pedestrians.
Here, all the fundamental facilities in public places are designed quite consideratly, especially for the disabled, the old, the pregnant women, and the children. It seems to me that there are some sub-rules which people here all abey automatically, although I cannot tell all of them clearly.
Most American people are more open-minded than most Chinese peoplel. Teenagers here are more free and independent than Chinese young people. The media here has more freedom, and people can get many controversial information in various fields, which is much less possible in China.
The average American people's living standard is much higher than that of China, but for the poor people, situations are always more or less similar, no matter which country they belong to.
According to the current prevail saying, the U.S. is developed, while China is developing. Indeed, U.S. does better in many aspects than China, especially for the political and social system. However, I believe that for both of them, improvement is always needed.