This makes sense by the simple observation that, all other things being equal, most people will want to live and work in what they consider their homeland. For many people who have come to the US, they have come not to find a new homeland but rather to get wealthy and pursue opportunity.
This is an admirable thing. But as China develops and grows - conditions becoming more equal between the US and China - it's only natural that Chinese expats will find that they can seek "riches" in what they feel is their homeland.
There's nothing wrong with this, and in fact will be good for people of all nationalities as competition increases for talent.
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