wichita.edu
… June 19 is the annual celebration of the end of slavery. Though the Emancipation Proclamation was signed Jan. 1, 1863, and the Civil War ended April 9, 1865, more than 250,000 remained enslaved in Texas when Union troops arrived in Galveston on June 19, 1865, to order their emancipation. Texas was the first state to adopt the formal holiday in 1980.…
https://www.wichita.edu/about/wsunews/news/2020/06-jun/juneteenth_7.php