Juneteenth From Wikipedia
Juneteenth (a portmanteau of June and nineteenth; also known as Freedom Day, Jubilee Day, and Liberation Day) is a holiday celebrating the liberation of those who had been held as slaves in the United States. Originally a Texas state holiday, it is now celebrated annually on the 19th of June throughout the United States, with varying official recognition. Specifically, it commemorates Union army general Gordon Granger announcing federal orders in Galveston, Texas, on June 19, 1865, proclaiming that all people held as slaves in Texas were free.
The Emancipation Proclamation had officially outlawed slavery in Texas and the other states then in rebellion against the U.S. almost two and a half years earlier, and the defeat of the Confederate States army in April 1865 allowed enforcement of that to begin. But Texas was the most remote of the slave states, with a low presence of Union troops, so enforcement there had been slow and inconsistent before Granger’s announcement. Although Juneteenth is commonly thought of as celebrating the end of slavery in the United States, it was still legal and practiced in Union border states until December 6, 1865, when ratification of the Thirteenth Amendment to the Constitution abolished non-penal slavery nationwide.