The presidency of Warren G. Harding began on March 4, 1921, when Warren G. Harding was inaugurated as President of the United States, and ended when he died on August 2, 1923, a span of 881 days. Harding, the 29th United States president, presided over the country in the aftermath of World War I. He also signed into law several bills designed to address the farm crisis and, along with Secretary of Commerce Herbert Hoover, promoted new technologies like the radio and aviation. Harding's foreign policy was directed by Secretary of State Charles Evan Hughes. The Sheppard–Towner Maternity Act funded almost 3,000 child and health centers, where doctors treated healthy pregnant women and provided preventive care to healthy children. Child welfare workers were sent out to make sure that parents were taking care of their children. Siena polls of 1982, 1990 and 1992 ranked him last. A 2008 study of presidential rankings for The Times placed Harding at number 34 and a 2009 C-SPAN survey ranked Harding at 38.