Employers may file a petition for an individual to be authorized to live and work permanently in the United States. Employers must verify that the individual is authorized to accept employment in the United States.
Naturalization is the manner in which a person not born in the United States voluntarily becomes a U.S. citizen.
If you were born outside of the United States, there are two general ways to obtain U.S. citizenship through U.S. citizen parents. You can acquire U.S. citizenship at birth (acquisition) or you can derive citizenship from your parents after your birth but before the age of 18 (derivation).
A Permanent Resident Card (USCIS Form I-551) is proof of your permanent resident status in the United States. It also serves as a valid identification document and proof that you are eligible to live and work in the United States.