Juneteenth is a celebration of African-American Emancipation. It commemorates the day in 1865 in Texas that General Gordon Granger read the proclamation declaring that ALL SLAVES ARE FREE. While Abraham Lincoln freed the slaves in his Emancipation Proclamation in 1862 with an effective date of January 1, 1863 that did not include border states not in rebellion or Texas where slaveowners moved to escape the fighting (unless these slaves escaped to non-slave states).
Now, they were all free with all the rights and privileges of all Americans (except of course for the reality of being Black in America in 1865).
One year later, in 1866, Freedmen celebrated the first anniversary of Juneteenth in Texas.
Contending with whites only spaces that continued for too many years, many pooled their money to buy land of their own in order to congregate and celebrate. Emancipation Park in Houston, Booker T. Washington Park in Mexia, and Emancipation Park in Austin are three of these places.
While celebrated in several states as a recognized holiday or observance, the National Juneteenth Observance Foundation is seeking an official designation of Juneteenth as an observation in all 50 states through Congress.
What is Juneteenth by Henry Louis Gates, Jr.
Slate (from 2015): The Black American Holiday Everyone Should Celebrate But Doesn’t
Juneteenth Honors March to Freedom (from 2008)
From the television series, Black-ish: