Tang shougang is one of a generation of young Chinese who seem to have it all. Aged just 35, Mr Tang (not his real name) has a well-paid job for a tech firm, and his wife owns a successful shop. They have two young sons, two cars and an apartment in downtown Shanghai worth a fortune. One perk enjoyed by others of their class, however, eludes them: a passport or long-term residents' visa for a country other than China. Ideally they would like a green card that makes it easier to live, work and educate their children in America. That looks difficult, so the Tangs are pondering other options.
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