“Juneteenth (officially Juneteenth National Independence Day and historically known as Jubilee Day,Black Independence Day, and Emancipation Day is a federal holiday in the United States that commemorates the end of slavery, and is regularly observed with celebrations of African-American culture. Originating in Galveston, Texas, it has been celebrated annually on June 19 in various parts of the United States since 1866. The day was recognized as a federal holiday on June 17, 2021, when President Joe Biden signed the Juneteenth National Independence Day Act into law. Juneteenth’s commemoration is on the anniversary date of the June 19, 1865, announcement of General Order No. 3 by Union Army general Gordon Granger, proclaiming freedom for slaves in Texas.” (From Wikipedia https://en.wikipedia.org/wiki/Juneteenth)
Learn more here. https://juneteenth.com/