1813 -- Mattias Lopez starts the first newspaper to be published in The Bronx, The Westchester Patriot, in West Farms.
1827 -- On July 4 New York State frees black slaves.
1841 -- Archbishop John Hughes establishes St. John's College, today's Fordham University, the first institution of higher learning in The Bronx.
1841 -- The New York and Harlem River Railroad, today the Harlem Division of Metro-North, is built, becoming the first railroad in The Bronx. It results in an increase in the population of the western part of The Bronx.
1846 -- Edgar Allan Poe moves to the village of Fordham, created by the presence of a railroad stop there, in a vain attempt to cure his wife, Virginia, of tuberculosis. He writes "Annabel Lee" and "The Bells" there. It is his last home; he dies in 1849.
1848 -- The Croton Aqueduct, designed by early American engineer John B. Jervis is completed. This includes the monumental High Bridge, in the shape of a Roman Aqueduct, over the Harlem River, which was also used as a footpath to Manhattan.
1861 -- Gas lighting is introduced into The Bronx.
-- In April, the American Civil War begins
1863 -- The iron dome of the Capitol Building in Washington, D.C. is manufactured in the Janes and Beebe (later Janes and Kirtland) Iron Works at 149th Street and Brook Avenue, then shipped to Washington by boat for assembly on site.
1867 -- Leonard W. Jerome opens the Jerome Park Racetrack. There he begins the Belmont Stakes, which is run there until the park closes in 1890. To attract wealthy New Yorkers to the track, he builds what is today Jerome Avenue.
1874 -- The towns of Morrisania, West Farms, and Kingsbridge are annexed to New York City, becoming the 23rd and 24th wards. These wards are placed under the control of the Department of Public Parks.
1886 -- The Third Avenue El (Elevated Train) is extended into The Bronx.
1887 -- Electricity is introduced into The Bronx.
1888 -- A commission purchases Van Cortlandt Park, Bronx Park, Pelham Bay Park, Crotona Park, Claremont Park, St. Mary's Park, Mosholu Parkway, Pelham Parkway, and Crotona Parkway. This is the foundation of the park system of The Bronx, which today covers 24% of the borough's land surface. Half of Bronx Park and all of Pelham Parkway and Pelham Bay Park are located outside of the city's boundaries of the time.
1889 -- The Washington Bridge between the mainland and Manhattan over the Harlem River opens.
1895 -- The town of Westchester, the incorporated village of Wakefield, and the southern parts of the towns of Eastchester and Pelham, all lying east of the Bronx River, are annexed to New York City and made part of the 24th Ward.
1897-- The first public High School, later named Morris High School, is established.
1898 -- The city of Greater New York is created as a federation of five boroughs with the 23rd and 24th Wards becoming the borough of The Bronx. Louis F. Haffen is elected the first Borough President.