How do immigrants apply for their parents to immigrate to the United States?

The meaning of "parents" in American immigration law includes: biological parents, stepparents and adoptive parents. However, if an American citizen obtains citizenship through legal adoption, he no longer has the right to apply for the permanent residence of his biological parents in the United States. Because the parents of American citizens are immediate family members, American immigration law stipulates that there is no limit on the number of immigrant visas for parents of American citizens to apply for green cards. If the parents of American citizens are outside the United States, their children can apply for I- 130 first, and the materials to be submitted include American citizenship paper, birth notarization (father's name is required), parents' marriage certificate, etc. After the immigrant visa is passed, you can go to the United States for permanent residence. If the parents of American citizens are already in the United States and have entered the country as legal non-immigrants, they can apply for adjustment of their status. In this case, they must apply to the Immigration Bureau through the "two-in-one" application procedure of I- 130/I-485, and get approval after the interview. Important tips for American citizens to apply for parents' immigration 1. When both parents of American citizens apply, immigrants need to submit two applications. 2. If the parents of American citizens adjust their status in the United States, the application for I- 130/I-485 should be submitted 60 days after the parents enter the country, otherwise the application for I-485 will be rejected because of the tendency to invest in immigrants. Third, the immigration law does not require parents of American citizens to be valid when applying for I-485, as long as they enter the country legally. Therefore, even if the parents who apply for I-485 overstay in the United States, when their I-485 application is accepted by the Immigration Bureau, their status has been legalized, that is, they live legally, waiting for I-485 processing. During this period, they can apply for work permits, etc.