Holding office for only a month, which U.S. president served the shortest term in office?

Unfortunately, William Henry Harrison's presidential tenure was short-lived (literally). Lasting only a month as ninth president in 1841, he died of typhoid or pneumonia after only 31 days in office. It's safe to say he didn't accomplish much in that short period, but his death did establish the proper succession regarding presidential deaths in office when VP John Tyler assumed the presidency – something the early constitution wasn't previously crystal clear on.

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