What's the difference between a green card and a nationality? What are the conditions for obtaining an American green card and citizenship?

A green card is a proof of permanent residency, and it is valid. You must apply for renewal before it expires, otherwise it will be invalid. Once you join the nationality, it will not expire unless there are special reasons (such as finding false materials for applying for naturalization). ).

There are several ways to apply for a green card, such as employers applying for a working relationship, applying for outstanding talents, investing in immigration, getting married, etc. Of course, there are other sensitive reasons. Each category has its own standards, such as the employer's work, and the employer has to prove that there is no suitable person among his citizens except the applicant. Excellent talents need to provide proof of outstanding contributions in this field. Marriage immigrants need to provide true and legal marriage certificates and so on. Each category is different.

You can apply for naturalization if you get a green card for five years and live in the United States for a certain period of time.