New York City annexes The Bronx (west)

Background. The Bronx was originally part of Westchester County. The territory west of the Bronx River, including the towns of Kingsbridge, West Farms, and Morrisania, was annexed to New York City in 1874. This annexation created the 'Annexed District of The Bronx.' The definite article 'The' in 'The Bronx' originated from the Bronx River and was first used in this district's name.

Legislative Process. The annexation was enacted by the state legislature in 1873, with the transfer becoming effective in 1874. The towns of Kingsbridge, West Farms, and Morrisania were abolished as part of this process. The town of Kingsbridge had been established in 1873 within the former borders of Yonkers, covering areas corresponding to modern neighborhoods like Kingsbridge, Riverdale, and Woodlawn Heights.

Administrative Impact. Following the 1874 annexation, the territory moved from Westchester County into New York County. This shift integrated the area into the existing municipal structure of New York City, which already included Manhattan. The 'Annexed District of The Bronx' served as the administrative designation for this newly acquired territory, distinct from the later borough structure established in 1898.