Calvin Coolidge 1872 - 1933. The 30th President of the US. "There is no right to strike against the public safety by anybody, anywhere, anytime." Calvin Coolidge was the 30th President of the United States. The son of a Vermont storekeeper, he entered Republican state politics by first serving as the mayor of Northampton, Mass. He quickly moved on to become state senator, lieutenant governor and eventually governor of Mass. Coolidge attained national acclaim when he called in the state guard during the 1919 Boston police strike. He ran as Warren Harding's vice president in 1920 and took office upon Harding's death in 1923. He was reelected by a huge majority in 1924. He managed to reduce the national debt by $2 billion in 3 years, but when eager Republicans wanted to renominate him in 1928, he chose not to run again.