Three years after the signing of the Emancipation Proclamation by Abraham Lincoln (which officially outlawed slavery in Texas and the other states in rebellion against the Union) saw many Black especially in the deep south still enslaved. Many plantation owners refused to tell and free their slaves until June 19th 1865. That is when General Gordan Granger (armed with the truth and the Union Army) marched into one of the last southern strongholds of Galveston, Texas and OFFICIALLY freed most of the enslaved Blacks in the confederacy. I say most because it was still legal and practiced in two Union border states (Delaware and Kentucky) until later that year when ratification of the Thirteenth Amendment to the Constitution abolished chattel slavery nationwide in December.
Creating Juneteenth also known as Freedom Day, Jubilee Day, Liberation Day, and Emancipation Day which is a holiday celebrating the emancipation of those who had been enslaved in the United States. Originating in Galveston, Texas, it is now celebrated annually on the 19th of June throughout the United States, with varying official recognition. It is commemorated on the anniversary date of the June 19, 1865 announcement by Union Army general Gordon Granger, proclaiming freedom from slavery in Texas.