[History Channel] Only 31 days after assuming office, William Henry Harrison, the ninth president of the United States, dies at the White House. The cause of death was officially reported as pneumonia.Born in Charles County, Virginia, in 1773, Harrison served in the U.S. Army in the old Northwest Territory and in 1800 was made governor of the Indian Territory, where he proved an able administrator. In 1811, he led U.S. forces against an Indian confederation organized by Shawnee Chief Tecumseh, and victory at the Battle of Tippecanoe brought an end to Tecumseh’s hopes for a united Indian front against U.S. expansion. In the War of 1812, Harrison gained his greatest fame as a military commander, recapturing Detroit from the British and defeating a combined force of British and Native Americans at the Battle of the Thames.