The Certificate of Naturalization (form N-550 or
N-570) is a document issued by United States government as
proof of a person having obtained U.S. citizenship through
naturalization (a legal process of obtaining a new
nationality). The Certificate of United States
Naturalization has been issued since October 1, 1991 by the
USCIS, and on or before September 30, 1991 by Federal Courts
and particular State Courts. The United States Certificate
of Naturalization is proof of an individual’s U.S.
citizenship through naturalization.