In 1846 the United States invaded Mexico after a series of border disturbances
following the American annexation of Texas in the previous year. The Mexicans
had never recognized Texan independence, and considered the new American
state a wayward province. President James K. Polk enraged Mexican officials
still more when he insisted that Texas' southern border lay at the Rio
Grande River, and not the more northerly Nueces, as Texans had previously
agreed. Polk jumped at a skirmish between Mexican and American troops,
north of the Rio Grande, as a call to arms. American troops quickly swept
into Santa Fe, in present-day New Mexico, and soon controlled California
as well. By 1847 American armies marching under generals Zachary Taylor
and Winfield Scott had won victories deep in the Mexican interior, including
here at Cerro Gordo. While the Democrats used the Mexican war to win new
territories for the young nation, many Whigs, including Congressman Abraham
Lincoln of Illinois, opposed the action. Whigs hoped to organize and refine
life in the United States' extant territories rather than accumulate new,
wild lands. But the Democrats' vision of westward expansion matched Americans'
hunger for new lands and opportunities, and helped bring the party to
political dominance in the antebellum period. Ironically, General Zachary
Taylor won the presidency as a Whig in 1848, only to die in office.