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Which United States president will go down in history as the greatest humanitarian to have served in the office? The Republican Herbert Hoover is often known as the "Great Humanitatarian" for his work administering famine relief in post-World War I Europe (and Bolshevik Russia) in the 1920s -- but he did all that before he actually became president. Others might make the case for Franklin Delano Roosevelt, the Democrat who succeeded Hoover in the White House, whose New Deal initiatives relieved poverty and sickness on a grand scale within the United States.