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
History of New York City dominated the South, Boston dominated New England; Chicago, the nation's railroad hub, dominated the Midwest United States; however, New York City dominated the entire nation in terms of communications, trade, finance, popular culture, and high culture. More than a fourth of the 300 largest corporations in 1920 were headquartered in New York City. In 1898, the modern City of New York was formed with the consolidation of Brooklyn (until then an independent city), Manhattan, and outlying areas. Manhattan and the Bronx were established as two separate boroughs and joined together with three other boroughs created from parts of adjacent counties