When do American marriage immigrants apply for citizenship in advance?

Starting with obtaining a permanent resident card (green card) in the United States.

American marriage immigrants apply for citizenship in advance, starting from obtaining the American permanent resident card (green card). This is one of the prerequisites for becoming a permanent resident of the United States. Obtaining American permanent resident status (green card) means that you have the right to live and work in the United States for a long time, but it is not the same as becoming an American citizen. Once you get a green card, you can legally live in the United States and enjoy some civil rights, such as employment, education and social welfare.