William Henry Harrison (1773-1841), America’s ninth president, served just one month in office before dying of pneumonia. His tenure, from March 4, 1841, to April 4, 1841, is the shortest of any U.S. president. Harrison, who was born into a prominent Virginia family, joined the Army as a young man and fought American Indians on the U.S. frontier. He then became the first congressional delegate from the Northwest Territory, a region encompassing much of the present-day Midwest. In the early 1800s, Harrison served as governor of the Indiana Territory and worked to open American Indian lands to white settlers. He became a war hero after fighting Indian forces at the Battle of Tippecanoe in 1811. Harrison went on to serve as a U.S. congressman and senator from Ohio. He was elected to the White House in 1840, but passed away a month after his inauguration, the first U.S. president to die in office.