In 1841, William Henry Harrison became the ninth President of the United States and John Tyler became the Vice-President of the United States. Both were born in Charles City County, approximately twenty-four miles from Richmond. William Henry Harrison had successfully defeated the Indian chief, Tecumseh, and his brother, "The Prophet," at Tippecanoe River in Indiana. From this experience he earned the title, "Old Tippecanoe" which became a part of the 1840 presidential campaign slogan: "Tippecanoe and Tyler too." William Henry Harrison has a most unique distinction in the history of the United States in that he served the shortest term of any President--March 4, 1841 to April 4, 1841. Upon his death from pneumonia, believed contracted during the inauguration ceremonies, the other Virginian, John Tyler, succeeded to the Presidency. Tyler had been a Congressman, a state legislator, a Governor of Virginia and a United States Senator before becoming President. During his term of office, the United States and Canada agreed upon a final boundary in the Treaty of Washington. Tyler approved the annexation of Texas to the Union near the end of his Presidential administration. The annexation of Texas to the United States caused bitter feeling between Mexico and the United States. In the Mexican War which followed, two Virginians, General Zachary Taylor of Orange County and General Winfield Scott of Dinwiddie County, participated in an outstanding manner: the former, in charge of the campaign at Monterey and at Buena Vista and the latter, in charge of the campaign at Vera Cruz and Mexico City. Other Virginians who received first-hand military experience during the Mexican War were Robert E. Lee, Thomas J. Jackson and Joseph E. Johnston. On September 7, 1846, the land including the town of Alexandria (originally Belhaven) which Virginia had ceded to Congress in 1789 was retroceded to Fairfax County. In the following year, Alexandria County was formed from that part of the District of Columbia which had formerly been a part of Fairfax County and the town of Alexandria became the county seat. Five years later, the town of Alexandria became the city of Alexandria through a charter regulation of the General Assembly, and its status as an independent city (not subject to county jurisdiction) was granted. While Alexandria was changing from a town to a city, another Virginian was elected President of the United States. Zachary Taylor, a native of Orange County, became the twelfth President of the United States. He had achieved national fame during the Mexican War and had earned the title "Old Rough and Ready." He defeated his military colleague, General Winfield Scott, at the Whig convention by winning the presidential candidacy and proceeded to defeat Martin Van Buren for the Presidency. After serving only sixteen months of his term, he died of typhus on July 9, 1850. The most important issue during his administration was the slavery controversy.