Kevin Costner honored the history of America and had hope for the future in a patriotic post celebrating July 4. Costner, 68, carried an American flag in an Instagram snap from a scene in his award-winning, directorial debut, “Dances With Wolves.”“Happy Fourth, friends,” he wrote. “I’ve spent my career diving into the history of America—both the ugly and the beautiful parts of it.”He added, “Today, I celebrate the HOPE that drove our ancestors.