Kevin Costner is back in the saddle with his latest project, Horizon: An American Saga, a four-part Western series that explores the tumultuous history of pre-and post-Civil War America. The Oscar-winning actor, director, and co-writer unveiled the first full trailer for the series on Monday, giving fans a glimpse of the sweeping saga that spans 15 years and multiple perspectives. Horizon: An American Saga follows the lives of families, friends ...