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Location:Texas, New Mexico, California; Northern, Central, and Eastern Mexico; Mexico City

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Location:Texas, New Mexico, California; Northern, Central, and Eastern Mexico; Mexico City

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United States: Commanders and leaders

James K. Polk
Winfield Scott
Zachary Taylor
Stephen Kearney
John Sloat
William Worth
Robert Stockton
Joseph Lane
Franklin Pierce
David Conner
Matthew Perry
John Frémont
Thomas Childs
Henry Burton
Edward Baker

William Ide Mexico:

Santa Anna
Mariano Arista
Pedro de Ampudia
José Flores
Mariano Vallejo
Nicolás Bravo
José de Herrera
Andrés Pico
Manuel Armijo
Martin de Cos
Pedro de Anaya
Agustín y Huarte
Joaquín Rea
Manuel Muñoz
Gabriel Valencia †
José de Urrea

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Mexican-American War, also called Mexican War, Spanish Guerra de 1847 or Guerra de Estados Unidos a Mexico (“War of the United States Against Mexico”), war between the United States and Mexico (April 1846–February 1848) stemming from the United States’ annexation of Texas in 1845 and from a dispute over whether Texas ended at the Nueces River (Mexican claim) or the Rio Grande (U.S. claim). The war—in which U.S. forces were consistently victorious—resulted in the United States’ acquisition of more than 500,000 square miles (1,300,000 square km) of Mexican territory extending westward from the Rio Grande to the Pacific Ocean.

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Mexican-American War, also called Mexican War, Spanish Guerra de 1847 or Guerra de Estados Unidos a Mexico (“War of the United States Against Mexico”), war between the United States and Mexico (April 1846–February 1848) stemming from the United States’ annexation of Texas in 1845 and from a dispute over whether Texas ended at the Nueces River (Mexican claim) or the Rio Grande (U.S. claim). The war—in which U.S. forces were consistently victorious—resulted in the United States’ acquisition of more than 500,000 square miles (1,300,000 square km) of Mexican territory extending westward from the Rio Grande to the Pacific Ocean.

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When war broke out, former Mexican president and general Antonio López de Santa Anna (the vanquisher of the Texan forces at the Alamo in 1836) contacted Polk. The U.S. president arranged for a ship to take Santa Anna from his exile in Cuba to Mexico for the purpose of working for peace. Instead of acting for peace, however, on his return, Santa Anna took charge of the Mexican forces.When war broke out, former Mexican president and general Antonio López de Santa Anna (the vanquisher of the Texan forces at the Alamo in 1836) contacted Polk. The U.S. president arranged for a ship to take Santa Anna from his exile in Cuba to Mexico for the purpose of working for peace. Instead of acting for peace, however, on his return, Santa Anna took charge of the Mexican forces.

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Treaty of Guadalupe Hidalgo and the war’s legacy

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Treaty of Guadalupe Hidalgo and the war’s legacy

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Polk had assigned Nicholas Trist, chief clerk in the State Department, to accompany Scott’s forces and to negotiate a peace treaty. But after a long delay in the formation of a new Mexican government capable of negotiations, Polk grew impatient and recalled Trist. Trist, however, disobeyed his instructions and on February 2, 1848, signed the Treaty of Guadalupe Hidalgo.