Brooklyn is a borough of the greater city of New York, and is located in the United States of America. It is the actual hometown to Mario and Luigi were born. Their very first appearance of this place was in Mario's Time Machine. It is also mentioned in many biographies that he lives in Brooklyn.
Brooklyn is the largest of New York City's five Boroughs. It's history can be traced as far back to the American Revolution. Most of the City played important roles in New York's politics. The population of Brooklyn is estimated to be around 2,000,000 according to the 2014 census. Around the 1850's Brooklyn was one of the largest cities in The United States besides New York City. Immigrants of all nationalities poured into Brooklyn doubling it's population and around the surrounding towns. The city was incredibly crowded with immigrants which was causing turmoil for infastructure. The Brooklyn Bridge, built in 1883, massively relieved congestion for the growing city. The city of Brooklyn was turned into a Borough in 1898 and was absorbed into Kings County some time later. It is under the leadership of New York City Charter. Brooklyn has grown to be a diverse, multicultural area of New York City with some of the most ethnically diverse neighborhoods in the world.