United States Citizenship The state of being vested with the rights, privileges, and duties of a citizen of the United States of America. A person who claims to be a U.S. citizen must provide verification of citizenship. and Immigration Services (USCIS United States Citizenship and Immigration Services.)

The agency in the U.S. Department of Homeland Security that is responsible for the administration and enforcement of the U.S. immigration laws. These services were formerly provided by the Immigration and Naturalization Service (INS) The name of the former federal agency in the Department of Justice that was responsible for the administration and enforcement of the U.S. immigration laws. See United States Citizenship and Immigration Services (USCIS)..