U.S. President Abraham Lincoln diverted several regiments of militia and volunteer troops after the Battle of Gettysburg to control the city. The rioters were overwhelmingly working-class men, mostly Irish or of Irish descent, who feared free black people competing for work and resented that wealthier men, who could afford to pay a $300 (equivalent to $9,157 in 2017) commutation fee to hire a substitute, were spared from the draft.
Initially intended to express anger at the draft, the protests turned into a race riot, with white rioters, predominantly Irish immigrants, attacking black people throughout the city. The official death toll was listed at either 119 or 120 individuals. Conditions in the city were such that Major General John E. Wool, commander of the Department of the East, said on July 16 that "Martial law ought to be proclaimed, but I have not a sufficient force to enforce it."
The military did not reach the city until the second day of rioting, by which time the mobs had ransacked or destroyed numerous public buildings, two Protestant churches, the homes of various abolitionists or sympathizers, many black homes, and the Colored Orphan Asylum at 44th Street and Fifth Avenue, which was burned to the ground.
The area's demographics changed as a result of the riot. Many black residents left Manhattan permanently (many moving to Brooklyn). By 1865, the black population fell below 11,000 for the first time since 1820.
New York's economy was tied to the South; by 1822 nearly half of its exports were cotton shipments. In addition, upstate textile mills processed cotton in manufacturing. New York had such strong business connections to the South that on January 7, 1861, Mayor Fernando Wood, a Democrat, called on the city's Board of Aldermen to "declare the city's independence from Albany and from Washington"; he said it "would have the whole and united support of the Southern States." When the Union entered the war, New York City had many sympathizers with the South.