The Bronx /?br??ks/, the northernmost of the five boroughs (counties) of New York City in the state of New York, lies south ofWestchester County.
European colonization of the Bronx began in 1639. The Bronx was originally part of Westchester County, but it was ceded to New York County in fragments before it became Bronx County.
The Bronx was called Rananchqua by the native Siwanoy band of Lenape (also known historically as the Delawares), while other Native Americans knew the Bronx as Keskeskeck. It was divided by the Aquahung River.