John Tyler (March 29, 1790 – January 18, 1862) was the tenth president of the United States from 1841 to 1845 after briefly serving as the tenth vice president in 1841; he was elected vice president on the 1840 Whig ticket with President William Henry Harrison. Tyler was a firm believer in manifest destiny and saw its annexation as providing an economic advantage to the United States, so he worked diligently to make it happen. He initially sought election to a full term as president, but he failed to gain the support of either Whigs or Democrats and withdrew in support of Democrat James K. Polk, who favored the annexation of Texas. Polk won the election, Tyler signed a bill to annex Texas three days before leaving office, and Polk completed the process. When the American Civil War began in 1861, Tyler sided with the Confederacy and won election to the Confederate House of Representatives shortly before his death. Some scholars have praised Tyler's political resolve, but historians have generally ranked his presidency lowly.