Friday is Juneteenth, a holiday celebrating the day in 1865 when the last remaining slaves in the U.S. were freed.This year marks the sixth time since 2021 that June 19 has been designated a federal holiday by Congress, and for many government workers, it is a day out of the office. That means some services might be closed on Friday.Efforts were underway as early as 1994 to make Juneteenth a federal holiday. In 1997, Congress began introducing r…