Calvin Coolidge was an American politician who served as the 30th President of the United States from 1923 to 1929. Coolidge was known for his conservative policies and his belief in limited government intervention in the economy. He was a proponent of individualism and free market capitalism, earning him the nickname 'Silent Cal' for his reserved and laconic communication style. Coolidge's presidency oversaw a period of economic prosperity known as the 'Roaring Twenties', but his popularity declined following the Great Depression.