William Henry Harrison was known as an American military officer and a principal contributor to the War of 1812. He served as the 9th President of the United States. He was the last president in US history to be born before the American Revolution. One of the saddest parts of his tenure as president is the fact that he died of pneumonia just 31 days into his term.
There were no antibiotics back in that era, which is why even the flu killed thousands of people every year - not even presidents were immune from this. Due to his untimely death, William served the shortest term of all US Presidents. Another "milestone" from his career is the fact that he was the first US President to die while still being in office.