That was one day.
My understanding is TX as a whole state did not permanently honor this until 1980. Per other poster comment.
Yes, in Texas it has mostly been an East Texas upper Gulf Coast celebration. Austin, DFW, a few other larger Central Texas cities also. I have no problem with being it appropriated as a national celebration but find it ironic or funny (I can’t find the right word) that a celebration regional to only part of Texas would become national.
https://www.tsl.texas.gov/ref/abouttx/juneteenth.html
Texas House Bill 1016 passed in the 66th Legislature, Regular Session, declared June 19, “Emancipation Day in Texas,” a legal state holiday effective starting in 1980. Since that time, the celebration of Juneteenth continues across the state of Texas with parades, picnics and dancing.
**************
Juneteenth declined in popularity in the early 1960s, when the civil rights movement, with its push for integration, diminished interest in the event. In the 1970s African Americans’ renewed interest in celebrating their cultural heritage led to the revitalization of the holiday throughout the state. At the end of the decade Representative Al Edwards, a Democrat from Houston, introduced a bill calling for Juneteenth to become a state holiday. The legislature passed the act in 1979, and Governor William P. Clements, Jr., signed it into law. The first state-sponsored Juneteenth celebration took place in 1980.
https://tshaonline.org/handbook/online/articles/lkj01