This coming Saturday is Juneteenth, a day that honors the emancipation of enslaved people in the United States. It honors June 19, 1865, when "General Gordon Granger rode into Galveston, Texas, and announced that enslaved people were now free," Mental Floss reports. Head over to Mental Floss to learn more about Juneteenth, including why it happened more than two years after Lincoln signed the Emancipation Proclamation, what happened after and how you can honor the holiday.