John Tyler in the context of "Martin Van Buren"

The Whig Party was a mid-19th century political party in the United States. Alongside the Democratic Party, it was one of two major parties from the late 1830s until the early 1850s and part of the Second Party System. As well as four Whig presidents (William Henry Harrison, John Tyler, Zachary Taylor, and Millard Fillmore), other prominent members included Henry Clay, Daniel Webster, Rufus Choate, William Seward, John J. Crittenden, and John Quincy Adams (whose presidency ended prior to the formation of the Whig Party). The Whig base of support was amongst entrepreneurs, professionals, Protestant Christians (particularly Evangelicals), the urban middle class, and nativists.

The party was hostile towards the ideology of "manifest destiny", territorial expansion into Texas and the Southwest, and the Mexican–American War. It disliked presidential power, as exhibited by Andrew Jackson and James K. Polk, and preferred congressional dominance in lawmaking. Members advocated modernization, meritocracy, the rule of law, protections against majority rule, and vigilance against executive tyranny. They favored an economic program known as the American System, which called for a protective tariff, federal subsidies for the construction of infrastructure, and support for a national bank. The party was active in both the Northern and Southern United States and did not take a firm stance on slavery, but Northern Whigs tended to be less supportive than their Democratic counterparts.

Presidential elections were held in the United States from November 1 to December 4, 1844. Democratic nominee James K. Polk narrowly defeated Whig Henry Clay in a close contest turning on the controversial issues of slavery and the annexation of the Republic of Texas. This is the only election in which both major party nominees served as Speaker of the House at one point, and the first in which neither candidate held elective office at the time.

President John Tyler's pursuit of Texas annexation divided both major parties. Annexation would geographically expand American slavery. It also risked war with Mexico while the United States engaged in sensitive possession and boundary negotiations with Great Britain, which controlled Canada, over Oregon. Texas annexation thus posed both domestic and foreign policy risks. Both major parties had wings in the North and the South, but the possibility of the expansion of slavery threatened a sectional split in each party. Expelled by the Whig Party after vetoing key Whig legislation and lacking a firm political base, Tyler hoped to use the annexation of Texas to win the presidency as an independent or at least to have decisive, pro-Texas influence over the election.

The vice president of the United States (VPOTUS, or informally, veep) is the second-highest ranking office in the executive branch of the U.S. federal government, after the president of the United States, and ranks first in the presidential line of succession. The vice president is also an officer in the legislative branch, as the president of the Senate. In this capacity, the vice president is empowered to preside over the United States Senate, but may not vote except to cast a tie-breaking vote. The vice president is elected at the same time as the president to a four-year term of office by the people of the United States through the Electoral College, but the electoral votes are cast separately for these two offices. Following the passage in 1967 of the Twenty-fifth Amendment to the US Constitution, a vacancy in the office of vice president may be filled by presidential nomination and confirmation by a majority vote in both houses of Congress. This was based on the Tyler Precedent set in 1841 when John Tyler became the first vice president to take over for a deceased president following the death of William Henry Harrison.

The modern vice presidency is a position of significant power and is widely seen as an integral part of a president's administration. The presidential candidate selects the candidate for the vice presidency as their running mate in the lead-up to the presidential election. While the exact nature of the role varies in each administration, since the vice president's service in office is by election, the president cannot dismiss the vice president, and the personal working-relationship with the president varies, most modern vice presidents serve as a key presidential advisor, governing partner, and representative of the president. The vice president is also a statutory member of the United States Cabinet and United States National Security Council and thus plays a significant role in executive government and national security matters. As the vice president's role within the executive branch has expanded, the legislative branch role has contracted; for example, vice presidents now preside over the Senate only infrequently.

Daniel Webster (January 18, 1782 – October 24, 1852) was an American lawyer and statesman who represented New Hampshire and Massachusetts in the U.S. Congress and served as the 14th and 19th U.S. secretary of state under presidents William Henry Harrison, John Tyler, and Millard Fillmore. Webster was one of the most prominent American lawyers of the 19th century, arguing over 200 cases before the United States Supreme Court in his career. During his life, Webster had been a member of the Federalist Party, the National Republican Party, and the Whig Party. He was among the three members of the Great Triumvirate along with Henry Clay and John C. Calhoun.

Born in Salisbury, New Hampshire, in 1782, Webster established a successful legal practice in Portsmouth, New Hampshire, after graduating from Dartmouth College and serving a legal apprenticeship. A prominent opponent of the War of 1812, he won election to the United States House of Representatives, where he served as a leader of the Federalist Party. Webster left office after two terms and moved to Boston, Massachusetts. He became a leading attorney before the U.S. Supreme Court, winning cases such as Dartmouth College v. Woodward, McCulloch v. Maryland, and Gibbons v. Ogden.

John Jordan Crittenden (September 10, 1787 – July 26, 1863) was an American statesman and politician from the U.S. state of Kentucky. He represented the state in the U.S. House of Representatives and the U.S. Senate and twice served as United States Attorney General in the administrations of William Henry Harrison, John Tyler, and Millard Fillmore. He was also the 17th governor of Kentucky and served in the state legislature. Although frequently mentioned as a potential candidate for the U.S. presidency, he never consented to run for the office.

During his early political career, Crittenden served in the Kentucky House of Representatives and was chosen as speaker on several occasions. With the advent of the Second Party System, he allied with the National Republican (later Whig) Party and was a fervent supporter of, and eventually a protege of Henry Clay and opponent of Democrats Andrew Jackson and Martin Van Buren.

The Tyler Precedent is the constitutional and political precedent set in 1841 by John Tyler, the vice president of the United States who ascended as president upon the death of President William Henry Harrison. At the time, the Constitution was unclear about whether the vice president should become president or merely act in that capacity upon a president's death. Asserting the former interpretation over the latter, Tyler had himself sworn in as president, moved into the White House, and assumed full presidential powers. Though a politically contentious move, Tyler's position won out and became the norm for presidential successions. Between Tyler's presidency and the passage of the Twenty-fifth Amendment to the United States Constitution codifying this arrangement, seven more individuals succeeded to the presidency in Tyler's manner.

William Rufus DeVane King (April 7, 1786 – April 18, 1853) was an American politician and diplomat. He was the 13th vice president of the United States from March 4 until his death in April 1853. King had previously served as a U.S. representative from North Carolina and a senator from Alabama. He also served as minister to France under President James K. Polk.

A Democrat, King was a Unionist and his contemporaries considered him to be a moderate on the issues of sectionalism, slavery, and westward expansion, which contributed to the American Civil War. He helped draft the Compromise of 1850. King is the only United States vice president to take the oath of office on foreign soil, and was inaugurated in Cuba, due to his poor health. He died of tuberculosis 45 days later, becoming the third vice president to die in office. Only John Tyler and Andrew Johnson, both of whom succeeded to the presidency, have had shorter tenures. King was the only U.S. vice president from Alabama.