Everyone tries to diss on the USA but the USA is the only first world country in the last couple decades that has had decent economy. There's a few exceptions because of niche things like Ireland (tax evasion) or Taiwan (semi conductor specialty) but for a mixed economy and one of the USA's size to start, no one else is close.
Anyone can hate on the Americans all they want but the Americans are the only competent government in the first world. Of course, much of that competence goes toward helping jews (Israel) but Americans still benefit from this. Canadians for example don't benefit at all from our leadership especially when compared to other countries. It's abysmal.
As for China specifically, the reason their stock market is flat is because the Chinese government used state-owned entities for most of their economic production and these entities edge out the private sector growth. China's stock market is just a trap for foreigners. The real Chinese economy is government owned not privately owned.