As the longest-serving president in U.S. history, elected to an unprecedented four terms, Franklin D. Roosevelt guided the nation through two of its greatest challenges: the Great Depression and the Second World War. Below, meet some of the people most important to America’s 32nd president, and tap or mouse over the photos to see how they appear in The HISTORY® Channel’s three-part documentary event “FDR.” Click on a category below or scroll through all.

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A photo of Mary McLeod Bethune A photo of Lebogang Sekete portraying Mary McLeod Bethune

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A photo of Winston Leonard Spencer Churchill A photo of actor Adrian Galley portraying Winston Churchill

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A photo of former President of the United States Dwight D. Eisenhower A photo of Nicholas Pauling portraying Dwight D. Eisenhower

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A photo of Fala the dog

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A photo of Henry Ford A photo of Anthony Watterson portraying Henry Ford

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A photo of John Nance Garner III

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A photo of King George IV A photo of Matt Newman portraying King George VI

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A photo of Lorena Hickok

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A photo of Harry Hopkins A photo of Anthony C. Hyde portraying Harry Hopkins

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A photo of Louis Howe A photo of Pierre Malherbe portraying Louis Howe

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A photo of Cordell Hull A photo of Robin Smith portraying Cordell Hull

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A photo of Harold Ickes A photo of Aubrey Shelton portraying Harold Ickes

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A photo of Missy LeHand A photo of Amy Louise Wilson portraying Missy LeHand

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A photo of General George Marshall A photo of Andre Jacobs portraying George Marshall

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A photo of Lucy Mercer A photo of Donna Cormack-Thomson portraying Lucy Mercer

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A photo of Frances Perkins A photo of Amanda Lane portraying Frances Perkins

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A photo of Anna Roosevelt A photo of Melissa Haiden portraying Anna Roosevelt

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A photo of Eleanor Roosevelt A photo of Alice Bounsall portraying Eleanor Roosevelt

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A photo of Elliott Roosevelt

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A photo of Franklin Roosevelt Jr

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A painting of James Roosevelt

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A photo of James Jimmy Roosevelt A photo of Ben Albertyn portraying James Jimmy Roosevelt

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A photo of John Roosevelt

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a photo of Sara Delano Roosevelt photo of Adrienne Pearce portraying Sara Delano Roosevelt

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Teddy Roosevelt photo photo of Rufus Jones portraying Theodore Roosevelt

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A photo of Alfred E. Smith photo of Nicky Rebelo portraying Alfred E. Smith

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A photo of Joseph Stalin A photo of Dawid Minnaar portraying Joseph Stalin

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Harry Truman photo

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A photo of Henry Agard Wallace

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Chicago History Museum/Getty Images

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Corbis/Getty Images

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Popperfoto/Getty Images

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Hulton Archive/Getty Images

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Universal History Archive/Getty Images

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Bettmann Archive/Getty Images

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Bettmann Archive/Getty Images

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Underwood Archives/Getty Images

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Paul Popper/Popperfoto/Getty Images

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Archive Photos/Getty Images

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James Jarche/Popperfoto/Getty Images

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Keystone-France/Gamma-Keystone/Getty Images

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Culture Club/Getty Images

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Oscar White/Corbis/VCG/Getty Images

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James E. Abbe/ullstein bild/Getty Images

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American Stock/Getty Images

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Library of Congress/Corbis/VCG/Getty Images

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Teddy Roosevelt cast photo by Marcos Cruz

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All other cast photography by Joe Alblas.

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