Juneteenth, also known as Freedom Day, Jubilee Day, Liberation Day, or Emancipation Day, is a holiday celebrating the emancipation of African-Americans who had been enslaved in the United States. For more information about the history and celebration see https://www.britannica.com/topic/Juneteenth
"On June 19, 1865, Union General Gordon Granger arrived in Galveston, Texas. He informed the enslaved African Americans of their freedom and that the Civil War had ended. This momentous occasion has been celebrated as Juneteenth -- a combination of June and 19 -- for over 150 years." - From the National Museum of African American History & Culture (NMAACH)