The Mexican–American War (1846–1848)
Began after a clash on disputed land north of the Rio Grande
US Presidents · 19th century
1795–1849 · American
Democratic
In office: 1845–1849
James K. Polk, the 11th president, was a Tennessee protégé of Andrew Jackson and the first "dark horse" presidential nominee. In a single term he fulfilled an expansionist agenda: settling the Oregon boundary with Britain and winning the Mexican–American War, which added California and the Southwest. He kept his pledge to serve only one term and died three months after leaving office.
The Mexican–American War (1846–1848)
Began after a clash on disputed land north of the Rio Grande
The Treaty of Guadalupe Hidalgo (1848)
Mexico ceded California and most of the present-day Southwest
The Oregon Treaty dividing the Oregon Country at the 49th parallel (1846)
Compromise with Britain despite the slogan 'Fifty-four forty or fight!'
The Walker Tariff (1846)
Substantially lowered tariff rates
Confirmation of the California gold discovery in his annual message (1848)
His December message to Congress helped trigger the Gold Rush of 1849
The Wilmot Proviso controversy (1846)
Failed attempt to ban slavery in territory gained from Mexico, bitterly dividing Congress