Kevin Costner and historian Doris Kearns Goodwin sit down with ET’s Cassie DiLaura to talk their new docuseries, ‘The West,’ premiering Memorial Day 2025 on History Channel. The new, eight-part series unpacks the history of the American West, territory Kevin knows well thanks to his work on ‘Yellowstone’ and projects like ‘Dancing With Wolves,’ which turns 35 this year.