Why do many people want to go to America?

First of all, I sincerely hope to become an American citizen. Second, the environment in this country is really good. Third, the United States is the most advanced country in the world. There are many reasons, but I think the most important thing is that my environment is too bad or unsatisfactory. I want to go to a better place, such as China. As long as I have money, I will definitely emigrate, even to Japan.