15 June 1849: U.S. #President James Knox #Polk dies in Nashville, #Tennessee at the age of 53. He was the 11th president and served from 1845-1849. Driven by the ideology of Manifest Destiny, his administration expanded the United States to the #Pacific Ocean by acquiring over a million square miles of land, including #California and the #Oregon Territory. #History #underrated #OTD #ad https://t.co/kt1WTsep5u