"In 2004, USCIS [U.S. Citizenship and Immigration Services] naturalized 537,151 persons. The leading countries of birth of new citizens were Mexico (63,840), India (37,975), and the Philippines (31,448). The largest number of persons naturalizing lived in California (145,593), New York (66,234), and Florida (43,795)." The report discusses the naturalization process, links with legal immigration, historical trends, and demographics.