Today in history: On June 19, 1865, Union troops arrived in Galveston, Texas, with news that the Civil War was over and that all remaining enslaved people in Texas were free — an event now celebrated nationwide as Juneteenth. Also on this date: In 1910, the first-ever Father’s Day in the United States was celebrated in Spokane, Washington. (President Richard Nixon would make Father’s Day a federally recognized annual observation through a proclamation in 1972.) In 1953, Julius Rosenberg, 35,