What is the relationship between immigration and green card and naturalization?

Immigration has nothing to do with the latter two. For example, immigrants are "spoken language" and green cards and citizens are "official languages", because in the general population, as long as they have obtained permanent residency in the United States, they are immigrants, and permanent residency can be green card holders or American citizens.

Green card: permanent residence qualification. After applying for a green card, you must contact and live in the United States for more than 180 days every year, otherwise it will be regarded as giving up the green card; Green card holders are American citizens and can travel freely between China and China.

Citizen: to become a citizen, you need to take the naturalization test; After getting a green card, you need to hold it for 5 years to qualify for American citizenship. After becoming an American citizen, China's citizenship was revoked, and it was very troublesome to apply for a visa at the embassy every time he returned to China, which is also the reason why many people are unwilling to transfer to American citizenship.

Supplement:

Immigration is an action, you immigrate from China; Green card and citizen are objective identities, and there is no comparability at all. I don't know why the landlord is entangled in this problem. How to immigrate without legal status? For example, I ask you what is the relationship between getting better and taking medicine? Immigration means getting better, and taking medicine means getting a green card or citizenship, okay?