page_title: James K. Polk
section_title: Course of the war
hierarchical_section_title: James K. Polk / Presidency (1845–1849) / Foreign policy / Mexican-American War / Course of the war
context_page_description: James Knox Polk was the 11th president of the United States, serving from 1845 to 1849. He previously was Speaker of the House of Representatives and governor of Tennessee. A protégé of Andrew Jackson, he was a member of the Democratic Party and an advocate of Jacksonian democracy. Polk is chiefly known for extending the territory of the United States during the Mexican–American War; during his presidency, the United States expanded significantly with the annexation of the Republic of Texas, the Oregon Territory, and the Mexican Cession following the American victory in the Mexican–American War.
  After building a successful law practice in Tennessee, Polk was elected to the state legislature and then to the United States House of Representatives in 1825, becoming a strong supporter of Andrew Jackson. After serving as chairman of the Ways and Means Committee, he became Speaker in 1835, the only president to have been Speaker. Polk left Congress to run for governor of Tennessee; he won in 1839, but lost in 1841 and 1843.
context_section_description: After the initial skirmishes, Taylor and much of his army marched away from the river to secure the supply line, leaving a makeshift base, Fort Texas. On the way back to the Rio Grande, Mexican forces under General Mariano Arista attempted to block Taylor's way as other troops laid siege to Fort Texas, forcing the U.S. Army general to the attack if he hoped to relieve the fort. In the Battle of Palo Alto, the first major engagement of the war, Taylor's troops forced Arista's from the field, suffering only four dead to hundreds for the Mexicans. The next day, Taylor led the army to victory in the Battle of Resaca de la Palma, putting the Mexican Army to rout. The early successes boosted support for the war, which despite the lopsided votes in Congress had deeply divided the nation. Many Northern Whigs opposed the war, as did others; they felt Polk had used patriotism to manipulate the nation into fighting a war the goal of which was to give slavery room to expand.
  Polk distrusted the two senior officers, Major General Winfield Scott and Taylor, as both were Whigs, and would have replaced them with Democrats, but felt Congress would not approve it. He offered Scott the position of top commander in the war, which the general accepted. Polk and Scott already knew and disliked each other: the President made the appointment despite the fact that Scott had sought his party's presidential nomination for the 1840 election. Polk came to believe that Scott was too slow in getting himself and his army away from Washington and to the Rio Grande, and was outraged to learn Scott was using his influence in Congress to defeat the administration's plan to expand the number of generals. The news of Taylor's victory at Resaca de la Palma arrived then, and Polk decided to have Taylor take command in the field, and Scott to remain in Washington. Polk also ordered Commodore Conner to allow Antonio López de Santa Anna to return to Mexico from his exile in Havana, thinking that he would negotiate a treaty ceding territory to the U.S. for a price. Polk sent representatives to Cuba for talks with Santa Anna.
  Polk sent an army expedition led by Stephen W. Kearny towards Santa Fe, to territory beyond the original claims in Texas.  In 1845, Polk, fearful of French or British intervention, had sent Lieutenant Archibald H. Gillespie to California with orders to foment a pro-American rebellion that could be used to justify annexation of the territory. After meeting with Gillespie, Army captain John C. Frémont led settlers in northern California to overthrow the Mexican garrison in Sonoma in what became known as the Bear Flag Revolt. In August 1846, American forces under Kearny captured Santa Fe, capital of the province of New Mexico, without firing a shot. Almost simultaneously, Commodore Robert F. Stockton landed in Los Angeles and proclaimed the capture of California. After American forces put down a revolt, the United States held effective control of New Mexico and California. Nevertheless, the Western theater of the war would prove to be a political headache for Polk, since a dispute between Frémont and Kearny led to a break between Polk and the powerful Missouri senator (and father-in-law of Frémont), Thomas Hart Benton.
  The initial public euphoria over the victories at the start of the war slowly dissipated. In August 1846, Polk asked Congress to appropriate $2 million as a down payment for the potential purchase of Mexican lands. Polk's request ignited opposition, as he had never before made public his desire to annex parts of Mexico (aside from lands claimed by Texas). It was unclear whether such newly acquired lands would be slave or free, and there was fierce and acrimonious sectional debate. A freshman Democratic Congressman, David Wilmot of Pennsylvania, previously a firm supporter of Polk's administration, offered an amendment to the bill, the Wilmot Proviso, that would ban slavery in any land acquired using the money. The appropriation bill, with the Wilmot Proviso attached, passed the House, but died in the Senate. This discord cost Polk'
caption: War News from Mexico (1848)
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