The U.S. isn’t the UK and immigration isn’t random -
The American Community Survey is really the only source of data on specific Asian national origin groupings resident in the United States (since it otherwise is just the “Asian” category) and that’s been explored already.
That's a very poor excuse.
First of all, academic performance is not positively correlated with socio-economic status. Second generation immigrant students raised by poor first generation parents perform better on average than first generation (language issues) students and third generation (too confortable living in rich lifestyles provided by their second generation parents) students as well.
Secondly, even though immigration is not completely random, it still results in the majority of immigrants coming in with much lower than average financial and educational background, which means that the majority of the Chinese coming in are not picked cream of the crop, but those who come to work menial jobs under the promise that such labor is more rewarding in the US than in China.
Thirdly, the imaginary scenerio that all of the best Chinese were selected for and taken out of China (don't even see how you could come to such a conclusion seeing all the Chinese restaurant workers and small shop owners in the Chinatowns across the US) is already debunked by the fact that Chinese scores at international competitions trump the scores of even the Chinese populations of other countries like the US and UK, which are all heavily Chinese because even in their native environments, this is the best team that could be comprised from fair selection.
Lastly, your arguments basically all mount to escapism. 1. There's no direct data separating the ethnicities within the Asian race in the US so nothing can substitute for it and 2. even if there were, it's because immigration isn't random. I guess those 2 excuses make it impossible to prove anything, right? LOLOL You sound like the kid who keeps saying he lost a ball game cus his shoes were made weird and he's not used to the way the ground is paved on this court. The thing about excuses is that all of the excuses in the world, which you seem to have, couldn't combine to be worth a single positive result, which China's got mountain loads of.