What is the reason why my friend immigrated to the United States and my passport was taken back by the Immigration Bureau?

Hey, let me explain some terms: immigrant green card citizen. \r\n 1。 Because your husband is an American citizen, you can apply for an American green card, but holding a green card is conditional and requires you to stay in the United States for several years. \r\n2。 Because you are a citizen of China, your husband can apply for a green card in China, but there are some restrictions. \ r \ nThe so-called immigration means getting a green card, not changing nationality. You got a green card in the United States, which means you immigrated to the United States, but you still hold a China passport, which means you are still a citizen of China. A green card is only equivalent to a long-term visa and only provides long-term residency. Citizens enjoy more rights, such as the right to vote and to be elected. Therefore, immigrants do not change their nationality or become citizens of one country, but they can live and work in another country without political rights. \ r \ The doll's statement that "once your husband chooses to immigrate to China, he must also give up his American citizenship" is wrong. Immigration will not change his nationality. \ r \ nIt is difficult to change nationality. Take the United States as an example First, you have to hold a green card for a certain number of years, and then you have to take a citizen exam. The content is probably related to legal history.