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The Pre-Civil War Era (1815–1850)

History SparkNotes

The Mexican War: 1844–1848

Manifest Destiny: 1835–1850

The Mexican War: 1844–1848, page 2

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Events
1844 James K. Polk is elected president
1845 The U.S. annexes Texas
1846 Congress passes the Walker Tariff Independent Treasury is reestablished U.S. resolves dispute over Oregon with Britain Mexican War erupts John Frémont seizes California
1847 General Winfield Scott captures Mexico City
1848 United States and Mexico sign Treaty of Guadalupe Hidalgo
Key People
James K. Polk -  Eleventh U.S. president; expansionist Democrat from Kentucky; acquired Oregon and California; fought the Mexican war
Henry Clay  -  Unsuccessful Whig candidate against Polk in 1844 election
Zachary Taylor -  Twelfth U.S. president; Mexican War hero; tried to dodge controversy over westward expansion of slavery

The Election of 1844

For the election of 1844, the Democrats nominated Speaker of the House James K. Polk on a platform supporting the annexation of Texas and demanding all of the Oregon Territory to the 54° 40' line. The Whigs, having formally kicked President John Tyler out of their party, Whigs selected Henry Clay (his third presidential bid). The new antislavery Liberty Party also nominated a weak candidate, mainly for show. In the end, though, Polk won 170 electoral votes to Clay’s 105; surprisingly, the Liberty Party stole just enough votes from Clay to tip the election toward the Democrats.

Annexing Texas

Tyler, concluding that Polk’s victory was a mandate from the American people to annex Texas, put the issue to a vote in both houses of Congress. Thus, in 1845, Congress officially annexed the Lone Star Republic. Mexico was outraged: they had refused to recognize Texas independence in 1836 and believed that the rebellious state would one day be reconquered. After the annexation announcement, Mexico withdrew its ambassador from Washington, D.C.

Then, a border dispute exacerbated the situation: whereas the United States claimed that Texas extended all the way south to the Río Grande, Mexico claimed that Texas was smaller, ending further north at the Nueces River. Both sides sent troops to the region, the Americans camping north of the Nueces and the Mexicans to the south of the Río Grande.

Polk’s Presidency

Polk went to the White House with a specific “to-do” list and accomplished all of his goals by the time he left. First, with the Walker Tariff of 1846, he reduced the tariff that had crept higher and higher since 1842. The new tariff set taxes on foreign goods at around 35 percent. Second, Polk reestablished the independent treasury that Martin Van Buren had created and that Tyler had decommissioned.

In addition, Polk wanted westward expansion, especially into Oregon and California. California had recently become a hot topic and prize in the West for its San Francisco Bay. However, acquisition of California would be difficult: it belonged to Mexico, which was not on good terms with the United States.

Acquiring Oregon

Acquiring Oregon was not difficult but did spark controversy. Recognizing that it could never win the population war in Oregon, Britain proposed giving the United States all of Oregon south of the 49th parallel rather than quarreling for the entire territory up to 54° 40'. The Senate agreed to the compromise, despite protests from many Americans who wanted the entire territory.

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