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Answer: It is commemorated on the anniversary date of the June 19, 1865 announcement by Union Army general Gordon Granger, proclaiming freedom from slavery in Texas.
The day's name is a combination of "June" and "nineteenth" in honor of the date of Granger's announcement and first appeared around 1903. It is also known as African American Freedom Day or Emancipation Day. ... Juneteenth is recognized as a state holiday or special day of observance in 45 states.