What is Juneteenth? .For more than 150 years, Juneteenth, or June 19, has been a day to celebrate the end of slavery in the United States. .Juneteenth is the day the last slaves learned of the freedom granted by emancipation proclamation. .The proclamation initially freed only slaves in the states that left the union when it was enacted Jan 1. 1863. .It took 30 months for news to reach slaves in Texas because no one was going to enforce it in confederate states. .Slaves in Texas did not know of former President Abraham Lincoln's until 1865