How to stay in the United States for a long time

Permanent residency: refers to the right granted by a country to foreigners to stay for a long time, that is to say, this person is still a foreigner, not a citizen of the host country. For China people living abroad, then he is an overseas Chinese.

Green card: the person with permanent residence has the proof of the host country. Most countries call it a green card, Japanese a landing card, some countries in South Asia have paper visas, and China is also a card. A card or visa that records permanent residency is called a green card.

Naturalization: refers to applying for the nationality of a country and becoming a citizen of that country. Generally, you have to obtain permanent residency first, and then you can become a citizen of that country through certain procedures.

Immigration is a common name for settling in other countries. Permanent residency and green card are the concepts of visa. Naturalization refers to the act of giving up one country's nationality and joining another country's nationality, which is roughly the same as immigration.