Yes, the economy will recover and employment will improve, but those jobs won't be going to new immigrants who aren't even familiar with the language and culture. As for opportunities, honestly business in the U.S. is not that much different. There are plenty of relationship hires and sons and daughters of corporate leaders and politicians. Like I said, if your technical skill is really good, you can probably get a ok job (keep in mind though you are still competing with all the Indian engineers). But if you want to do business here, lack of background and money will be as big of an obstacle here as they are in China for you.
I am not sure if you are familiar, but healthcare is prohibitively expensive here; health insurance premiums are high and many don't even offer basic coverage.  roperty taxes and inheritance taxes are pretty high as well. A lot of welfare benefits are being taken away, especially the ones for new immigrants. It's not worse than China for sure, but not better either.
"更加公平和舒适的生活环境" - Mostly a myth. Nicer environment, yes; more fair competition in business, not really. I am not saying the U.S. is a horrible place to live, but often times people in China are way too idealistic about their opportunities here. Just a word of caution, that's all.