Juneteenth is also known as Jubilee Day, Emancipation Day, Freedom Day, and Black Independence Day.
Juneteenth is a combination and the month "June" and the date "nineteenth". This date commemorates June 19th, 1865, when enslaved peoples in Gavleston, Texas found out slavery was abolished two years prior in 1863. June 19th was the day the remainder of Confederate States were told of the proclamation. On June 19th, 1865 Union Army general Gordon Granger announced General Order No. 3 in Gavleston, proclaiming freedom for slaves in Texas. Texas was the last state in the Union with institutionalized slavery.
On June 17th, 2017, President Biden signed the Juneteenth National Independence Day Act, creating the newest Federal Holiday since Martin Luther King Jr. Day in 1983.