I have a green card. How to apply for an American green card for 18-year-old son?

Only you can apply for your son. You are a green card, and the timetable for applying for unmarried minor children is 4- 1 1 month. Someone told you that three years is bullshit.

Your wife remarried and is not related to your son. Your wife will not be able to apply for your son directly. Someone asked your wife why she didn't apply. Because she has brains. . .

You can submit your application case immediately, and the Immigration Bureau will handle it quickly. Don't be over age.

You can apply for him, and then go through the immigration formalities after he gets a green card. The same is true of going back to college. I am still a citizen of China because I have a green card.

But if your son is 22 years old and you apply for him, you will have to wait for an appointment.

As for the formalities, I especially suggest that you find a lawyer to represent you. Because I feel that you are not particularly professional, you need to fill in and supplement a lot of documents, and you need to prepare a lot of materials about you and your son. It's not that I can tell you to complete the application remotely from here.

What state are you in?