Decades after the American Revolution, thousands of men and women remained enslaved in northern states, hidden behind gradual emancipation laws that promised freedom but delivered only delayed bondage. New Jersey was the last northern state to hold onto the institution, reporting more than 600 people still legally enslaved as late as 1840. In 1804, New Jersey passed a gradual emancipation law that freed no one already in bondage. Children born to enslaved mothers after that year were required to serve their mother’s master until adulthood—boys until age 25, girls until 21.
Those already enslaved remained in bondage for life, while their children faced decades of forced labor before any promise of freedom. The law was presented as a compromise, but it was a compromise paid for by the enslaved. In the same year the legislature passed it, a public auction near the Delaware River advertised the sale of a man in his 30s, a young woman, and two children. The notice appeared in a local paper like any other commercial listing, describing the adults as healthy and accustomed to labor and the children as future workers.
New Jersey’s resistance to ending slavery was rooted in economics. Farms relied on enslaved labor for dairy, grain, and domestic work, and families who owned only one or two enslaved people still saw them as essential. Politicians chose gradual emancipation to protect those interests while maintaining appearances. By 1820, hundreds of Black residents of New Jersey remained enslaved.
In 1840, nearly 700 people were still in bondage, many of them elderly individuals born before 1804 and trapped for life. When the Civil War began, the 1860 census recorded 18 people in New Jersey still legally enslaved—in a state that would fight on the side of the Union. Other northern states followed similar patterns. Connecticut and Rhode Island passed gradual emancipation laws that allowed slavery to fade slowly.
New York did not fully abolish slavery until 1827, and on the day before emancipation took effect, enslavers rushed to sell people southward while they still could. Pennsylvania’s 1780 gradual emancipation law required children of enslaved mothers to serve until age 28, meaning two full generations lived in bondage after the law was passed. The 1830 census counted more than 2,000 enslaved people still living in northern states. Vermont is often praised for banning slavery in its 1777 constitution, but historians note the ban was weakly enforced, with wealthy families holding people in servitude under other names such as indenture.
In 1854, Boston—the city celebrated as the cradle of liberty—became the scene of one of the most dramatic betrayals of the era. Anthony Burns, a 20-year-old man who had escaped slavery in Virginia the previous year, was arrested under the Fugitive Slave Act of 1850 and held in a Boston courthouse. The Fugitive Slave Act required northern states to return escaped slaves to their owners and gave federal marshals the power to seize fugitives anywhere. Burns had found work in a clothing shop and tried to live quietly, but his former master, Charles Suttle, learned of his whereabouts and sent men to claim him.
Outrage spread quickly through Boston’s abolitionist community. On the night of May 26, 1854, a mob stormed the courthouse with axes and clubs in an attempt to free Burns. Shots were fired and a guard was killed, but the attempt failed. President Franklin Pierce ordered federal troops into the city to ensure the Fugitive Slave Act was enforced.
On June 2, 1854, Anthony Burns was marched to the harbor surrounded by more than a thousand armed soldiers. Crowds lined the streets, some weeping, some shouting, as he was placed aboard a ship and sent back to slavery in Virginia. The case transformed Boston and hardened national divisions. Abolitionists raised money to purchase Burns’s freedom, and by 1855 he was free again.
He later studied for the ministry. In the South, slaveholders celebrated the enforcement of the law. In the North, resistance deepened as even moderates began to see the Fugitive Slave Act as intolerable. Seven years later, the North’s racial and class tensions exploded in New York City.
In July 1863, Congress passed the first federal draft in American history, the Conscription Act. Wealthy men could avoid service by paying $300 or hiring a substitute—a fortune for working-class immigrants who saw the law as a system where the poor would fight while the rich bought their safety. On July 13, 1863, anger over the draft erupted into violence. Crowds stormed the draft office on Third Avenue, smashed windows, and set the building ablaze.
For four days, New York became a war zone. The mobs turned most viciously toward Black citizens. Men, women, and children were beaten in the streets. Black-owned businesses were destroyed.
The Colored Orphan Asylum, home to more than 200 children, was burned to the ground, though the children miraculously escaped. At least 120 people were killed, though some historians believe the true number was far higher. Union troops fresh from the Battle of Gettysburg were rushed into the city and restored order by force, firing into crowds and positioning cannons at key intersections. The riots revealed how deeply racism and class resentment ran in the Union’s largest city.
Afterward, many Black residents left New York permanently, and the city’s Black population declined for years. Northern political leaders also made compromises that contradicted their public image. In 1861, as the nation broke apart, Congress approved the Corwin Amendment, a proposal that would have prevented Congress from ever interfering with slavery where it already existed. The amendment’s language was explicit: no future constitutional amendment would authorize the abolition of or interference with domestic institutions, including persons held to labor or service.
Abraham Lincoln did not oppose it. In his first inaugural address, he said he had no objection to the amendment, believing it might reassure the South and prevent further secession. He ordered copies sent to every state governor. At that point, Lincoln’s priority was preserving the Union at all costs.
He viewed secession as worse than slavery itself. The Corwin Amendment never took effect. Only a handful of states ratified it before the fall of Fort Sumter and the outbreak of war made compromise meaningless. But the amendment was never officially revoked, and it technically remained pending even after the 13th Amendment abolished slavery in 1865.
Northern industry was equally entangled with the slave economy. By the 1830s and 1840s, railroads were spreading across the North, and they carried more than coal and timber. Cotton was the single most valuable export in the nation, and nearly every bale traveled on rails connected to northern capital. Tobacco, rice, and sugar followed the same routes.
New York City stood at the center of this exchange, with docks overflowing with southern cotton shipped by railroad lines built and financed by northern investors. By 1860, nearly two-thirds of America’s exports were cotton, and every step of that trade enriched northern merchants, bankers, and rail executives. The Baltimore and Ohio Railroad relied heavily on southern trade, hauling tobacco, grain, and cotton from slave states to northern markets. The Pennsylvania Railroad, the largest corporation of its day, openly transported slave-grown cotton.
Some railroad companies built spurs directly to plantation gates to move cotton with maximum efficiency. Northern businessmen also invested directly in the South, financing track construction that tied plantations to ports. In some cases, enslaved people were used as collateral when planters secured credit for rail extensions. Abolitionist newspapers warned that northern industry was married to the lash, and their charges were not exaggerated.
For every sermon preached against slavery in New England, there were contracts signed in boardrooms that tied northern fortunes to southern bondage. When the Civil War broke out, northern railroads panicked over the loss of southern business. Profits collapsed as Union blockades cut off cotton exports. Many companies turned to Washington, lobbying for federal contracts to transport troops and supplies.
Railroads that had once hauled cotton now hauled soldiers, and the infrastructure built on years of profiting from slavery became one of the Union’s greatest strategic advantages. The North’s claim to moral superiority after the war obscured these realities. Schoolbooks portrayed the Union as the land of liberty fighting to free slaves in the South, but the full truth included northern slavery, northern sales of human beings, northern enforcement of fugitive slave laws, and northern fortunes built on slave-grown crops. The chains of the North were quieter, but they were real.
And they lasted far longer than most Americans were ever taught.
