Most Black Americans know the history and the legacy of June 19, 1865, the day Union troops finally reached Galveston, Texas, announcing that enslaved people had been freed – a full two and a half years after the Emancipation Proclamation was signed. The celebratory day, which became known as Juneteenth, became a federal holiday in 2021. At that time, only 37% of American adults knew what the holiday meant.