In a couple of weeks, Americans — mostly black Americans — will celebrate the 155th Juneteenth holiday. On June 19, 1865, two years after… — In a couple of weeks, Americans — mostly black Americans — will celebrate the 155th Juneteenth holiday. On June 19, 1865, two years after the Emancipation Proclamation and two months after the Civil War formally ended, 250,000 African-American slaves living in Texas were finally informed of their liberation. News of…