Demographics of New York City genetic signature on their Y chromosomes inherited from Niall of the Nine Hostages, an Irish high king of the 5th century A.D. New York City has the largest population of Italian Americans in the United States of America as well as North America, many of whom inhabit ethnic enclaves in Brooklyn, the Bronx, Manhattan, Queens, and Staten Island. New York City is home to the third largest Italian population outside of Italy, behind Sao Paulo, Brazil and Buenos Aires, Argentina, respectively. The largest wave of Italian immigration to the United States took place in the late 19th century and early
Boroughs of New York City form the new Nassau County. The borough of Staten Island, concurrent with Richmond County, was officially the borough of Richmond until the name was changed in 1975 to reflect its common appellation, while leaving the name of the county unchanged. There are throughout the five boroughs of New York City, many with a definable history and character to call their own. Since 1914, each of New York City's five boroughs has been coextensive with a county of New York State – unlike most U.S. cities, which lie within a single county or extend partially into another county, constitute a county