A more thorough explanation:

Derivation of citizenship is a legal concept that allows a child to become a citizen of the United States if one of their parents becomes a naturalized citizen. This means that the child can automatically become a citizen without having to go through the regular process of applying for citizenship.

For example, if a child's mother becomes a naturalized citizen of the United States, the child may be able to derive citizenship from her. This is true even if the child was born in another country and has never lived in the United States.

The Child Citizenship Act of 2000 provides guidelines for how this process works. In order for a child to derive citizenship, they must meet certain requirements. For example, the child must be under the age of 18 and must have a green card at the time their parent becomes a citizen. Additionally, the child must be living with their parent at the time.

Adopted children can also derive citizenship from their parents. If a child is adopted by a U.S. citizen, they may be able to become a citizen themselves if they meet certain requirements. For example, the child must have been adopted before the age of 18 and must have a green card at the time their parent becomes a citizen. Additionally, the adoptive parent must have had custody of the child and the child must not have been married at the time.

Overall, derivation of citizenship is an important concept for families who are navigating the immigration system. It allows children to become citizens more easily and can help to keep families together.