American immigration account problem

Immigrants are not naturalized. After immigration (so-called green card), you will still get a China passport, and your account will not be cancelled. Unless you specifically ask for it ...

Many people have been naturalized for many years and still have two passports to use back and forth. Of course, the premise is that the passport before naturalization has not expired, because the account will be cancelled as soon as a new passport is issued. . . .