state마다, 같은 state 안에서도 학교마다 다를 수 있으니 그 학교에 대한 내용을 봐야 됩니다.

예를 들어 CA의 경우입니다. https://www.ucop.edu/residency/residency-requirements.html
3번을 잘 읽어 보세요. 아래에서 you 는 학생입니다.

Residency requirements

There are four requirements you must fulfill in order to be a California resident for purposes of tuition at UC. All these requirements must be met by the residence determination date (generally the first day of classes) of the term for which you request a resident classification.

1. Physical presence

You must be continuously physically present in California for more than one year (366 days) immediately prior to the residence determination date of the term for which you request resident status. If you moved to California primarily to attend the University of California, you are here for educational purposes and may not be eligible for a resident classification for purposes of tuition.

Read the full policy on physical presence (pdf)

2. Intent to remain in California

You must establish your intent to make California your home one year prior to the residence determination date of the term for which you request resident status.

Read the full policy on intent to remain in California (pdf)

3. Financial independence

If you’re an unmarried undergraduate under the age of 24 and your parent(s) are not California residents, you must be able to verify financial independence for the two full years immediately preceding the term you wish to enroll. Graduate students are presumed to be financially independent unless they were claimed as a dependent on their parents’ federal tax return for the most recent tax year.

Read the full policy on financial independence (pdf)

4. Immigration status

You must have the legal ability to establish a permanent domicile in the United States, meaning that you must be a citizen or permanent resident of the United States or hold a valid, qualifying nonimmigrant visa.

Read the full policy on immigration status (pdf)