My boyfriend's father is an American citizen, and now my boyfriend is also scheduled to immigrate to Shanghai and apply as an "unmarried child".

1: Yes, he must leave, but he can get a green card and come back later, but remember to stay in the United States for more than six months a year.

After you get the visa, you will go to America. After getting a green card in the United States, you can go back to China to live, but as mentioned above, you can't stay in China for more than half a year, otherwise it will be difficult to return to the United States. So living and working in China is not realistic.

Of course, you can get married if you get a visa, and you can only get married in China because you can't go to the United States.

Your boyfriend can apply for you to go to America immediately after he gets married.

5. After your boyfriend comes to America, if 18 years old, he can become an American citizen directly. If you are over 18, you can only get a green card. After holding a green card for 5 years, you can apply for a naturalization test. After passing the test, you can become an American citizen and reunite with you within 6-9 months. If he applies for a spouse to go to the United States as a green card holder, the waiting period is very long, and it takes 5.