NJ held out as long as they could.
"Lincoln's 1863 Emancipation Proclamation did not free enslaved African Americans in the Northern States; it freed only those in the mostly southern "rebellious states." Two years later, New Jersey bitterly refused to ratify the Thirteenth Amendment, the United States Constitutional Amendment that abolished slavery and involuntary servitude across the country.
Slavery’s final legal death in New Jersey occurred on January 23, 1866, when in his first official act as governor, Marcus L. Ward of Newark signed a state Constitutional Amendment that brought about an absolute end to slavery in the state. In other words, the institution of slavery in New Jersey survived for months following the declaration of freedom in Texas."
https://nj.gov/state/historical/his-2021-juneteenth.shtml
"Lincoln's 1863 Emancipation Proclamation did not free enslaved African Americans in the Northern States; it freed only those in the mostly southern "rebellious states." Two years later, New Jersey bitterly refused to ratify the Thirteenth Amendment, the United States Constitutional Amendment that abolished slavery and involuntary servitude across the country.
Slavery’s final legal death in New Jersey occurred on January 23, 1866, when in his first official act as governor, Marcus L. Ward of Newark signed a state Constitutional Amendment that brought about an absolute end to slavery in the state. In other words, the institution of slavery in New Jersey survived for months following the declaration of freedom in Texas."
https://nj.gov/state/historical/his-2021-juneteenth.shtml