Herbert Clark Hoover (August 10, 1874 – October 20, 1964), the thirty-first President of the United States (1929–1933), was a world-famous mining engineer and humanitarian administrator. As the United States Secretary of Commerce in the 1920s under Presidents Warren Harding and Calvin Coolidge, he promoted economic modernization. In the presidential election of 1928 Hoover easily won the Republican nomination. The nation was prosperous and optimistic, leading to a landslide for Hoover over the Democrat Al Smith, a Catholic whose religion was distrusted by many. Hoover deeply believed in the Efficiency Movement (a major component of the Progressive Era), arguing that there were technical solutions to all social and economic problems. That position was challenged by the Great Depression, which began in 1929, the first year of his presidency. He energetically tried to combat the depression with volunteer efforts and government action, none of which produced economic recovery during his term. The consensus among historians is that Hoover's defeat in the 1932 election was caused primarily by failure to end the downward spiral into deep depression, compounded by popular opposition to prohibition, Hoover's lack of charisma in relating to voters, and his poor skills in working with politicians.