President Biden has signed legislation creating a new federal holiday for Juneteenth to mark the end of slavery in the United States. The celebration marks June 19, the day in 1865 that enslaved people in Galveston, Texas, learned of the Emancipation Proclamation — signed by Abraham Lincoln more than two years prior — and that the Civil War had ended. A White House signing ceremony Thursday was kicked off by Kamala Harris, the first African American vice president.