December 6, 1865.
Only most Southern slaves were freed in June of 1865. Northern slaves continued to be held in bondage till the ratification of the 13th amendment, which occurred December 6, 1865.
Actually slaves weren’t freed in Indian Country (Oklahoma) until the U.S. entered into treaties with the Five Civilized Tribes in 1866.
In point of fact they were freed January 1, 1863. It wasn't till the Union forces liberated the areas held by the Confederacy that most could take advantage of it.
Northern slaves continued to be held in bondage till the ratification of the 13th amendment, which occurred December 6, 1865.
And Southern slaves in areas that the Union forces held prior to January 1,1863.