Juneteenth is an annual event celebrating the end of chattel slavery in the United States in commemorating the issuance of General Order No. 3 (which included the line “all slaves are free”) in Galveston, Texas on 19 June 1865. In 2021, Juneteenth was declared a federal holiday and is also celebrated outside of the United States.
https://www.worldhistory.org/article/2239/history-of-juneteenth/

