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Since 1789, ** different men have served as the President of the United States. In that time, the majority of presidents served their full four- or eight-year terms, while **** died while in office, and **** more were assassinated. The shortest term served by a US president was William Henry Harrison, who died just ** days into his tenure. The longest term ever served was by Franklin D. Roosevelt, who is the only president to have been elected more than *** times; although he died just forty days into his fourth presidential term. The only president to have ever resigned while in office was Richard Nixon, who stepped down amid the Watergate scandal in 1972. For most of U.S. history, presidents have been inaugurated in March following the election; however, since 1953, US presidents have been sworn in on January 20, providing there were no extenuating circumstances.