Most persons born in the United States are Citizens of the United States at birth. Some persons, who were born outside of the United States, and have at least one U.S. Citizen parent, and meet certain other conditions, are Citizens of the United States at birth.

A person seeking to become a Citizen of the United States can become one through the process of Naturalization.

A person seeking proof of the fact that he or she is already a Citizen of the United States, may file an Application for Certificate of Citizenship, or a passport application.

A person seeking to become a Citizen of the United States, in general, must file an Application for Naturalization.