🗺️James K. Polk

11th President · 1845–1849 · Democratic

James K. Polk may be the most consequential one-term president in American history. He pledged to achieve four specific goals — tariff reform, re-establishing an independent Treasury, settling the Oregon boundary dispute, and acquiring California — and accomplished all four. His presidency added more than 800,000 square miles to the United States, second only to the Louisiana Purchase in territorial expansion.

The Dark Horse

Polk was a Tennessee protégé of Andrew Jackson and a former Speaker of the House. He won the 1844 Democratic nomination on the ninth ballot as a "dark horse" — the first candidate nominated on a major convention's blind vote — and narrowly defeated the Whig Henry Clay. His campaign slogan "54-40 or Fight!" referred to his claim to the entire Oregon Country up to the 54th parallel.

Manifest Destiny

Polk's presidency was the high-water mark of Manifest Destiny. He settled the Oregon question peacefully with Britain, accepting the 49th parallel as the border (the current Canada-U.S. line) rather than fighting for 54-40. He engineered the annexation of Texas — Tyler's last-minute accomplishment — into actual statehood. And he provoked a war with Mexico.

Mexican-American War

The Mexican-American War (1846–1848) resulted from a border dispute over Texas and Polk's desire to acquire California. After a short, decisive campaign, the Treaty of Guadalupe Hidalgo ceded to the United States: California, Nevada, Utah, most of Arizona and New Mexico, and parts of Colorado and Wyoming — about 529,000 square miles — in exchange for $15 million. The acquisition reignited the slavery question that would lead to the Civil War.

Died Young

Polk pledged to serve only one term and kept the promise, refusing to seek re-election. He was exhausted from the presidency — he took only six weeks of vacation during his four years — and died of cholera three months after leaving office, at 53. He had the shortest retirement of any president.

Polk Trivia

• Polk was the last Speaker of the House to later become president.
• He was 49 at inauguration — the youngest president to that point.
• California's gold was discovered days before the Treaty of Guadalupe Hidalgo was signed — news didn't reach Mexico or Polk in time to affect the terms.
• Polk's diary, kept faithfully through his presidency, is one of the most valuable primary sources for antebellum America.

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