President Harding died unexpectedly while in office, so the vice president, Calvin Coolidge, stepped up. Coolidge succeeded to the presidency on August 3, 1923. He went on to win the next election and therefore served as president of the U.S. for six years. In this photo Coolidge wears a black armband in mourning for Harding. While he mourned the man, he set out to rebuild his government. These were years of prosperity for the United States. On what did Coolidge focus his efforts?