TED-Ed Lesson: At the end of the Civil War, though slavery was technically illegal in all states, it still persisted in the last bastions of the Confederacy. This was the case when Union General Gordon Granger marched his troops into Galveston, Texas on June 19th and announced that all enslaved people there were officially free. Karlos K. Hill and Soraya Field Fiorio dig into the history of Juneteenth.