On September 22, 1862, President Abraham Lincoln issued the Preliminary Emancipation Proclamation effectively ending slavery on January 1, 1863, however, the Proclamation had little effect in the State of Texas until two and half years later. It was on June 19, 1865, that Union General Gordon Granger read General Orders No. 3 to the people of Galveston,
Texas:

“The people of Texas are informed that in accordance with a proclamation from the Executive of the United States, all slaved are free. This involves an absolute equality of personal rights and rights of property between former masters and slaves, and the connection heretofore existing between them becomes that between employer and hired labor.” 

In 2021 Juneteenth was made a Federal Holiday. A bill was also signed in Oregon for Juneteenth to become a State Holiday the following year in 2022.