"Coolidge was the last president to write all of his own speeches." Not so "Silent Cal" after all! Calvin Coolidge became president after Warren Harding's sudden death in 1923. The Calvin Coolidge Presidential Foundation and Library of Congress mark the centennial of the 30th president's ascension to office with a conference on his political development, signature economic policies, and legacy. Watch, starting at 3:15pm ET, Saturday on C-SPAN 2 | American History TV

100 years ago, Calvin Coolidge was sworn-in to his second term as the 30th president of the United States. Known as "Silent Cal," he often spoke about the power of saying little, noting, "If you don't say anything, you won't be called on to repeat it.” | CBS Evening News