Timeline from the Mexican-American War to the Mexican Cession
May 9, 1846, word reached Washington, D.C. that American troops had been attacked by Mexican
forces on April 4. Polk asked Congress, and was granted, a declaration of war.1846- Battle of Palo Alto, the first important
engagement of the Mexican War, was faught, with the Mexicans on the losing side.
1846- Battle of Resaca de la Palma, U.S. forces under General Taylor forced the Mexican
army back across the Rio Grande.
1846- U.S. forces crossed the Rio Grande, led by General Zachary Taylor. The Americans occupied
1846- Monterrey, Mexico, was captured by U.S. forces under General Zachary Taylor after
a four day engagement that made "Old Rough and Ready" Taylor, a Whig, into a national hero. His relations with President Polk,
a Democrat, cooled subsequently.
1847- Battle of Buena Vista, U.S. forces under General Zachary Taylor defeated the Mexicans
under General Antonio Lopez de Santa Anna.
1847- U.S. forces under General Winfield Scott landed near Vera Cruz, Mexico. Some 10,000
troops landed in the Western Hemisphere, in what was the first large=scale amphibious operation in U.S. history. Scott began
a siege of Vera Cruz on March 22. The fortress fell on March 27 and was occupied two days later. On April 8 Scott moved toward
1847- To negotiate peace with Mexico, President James K. Polk appointed as his special agent
Nicholas P. Trist, a State Department veteran.
1847- At Cerro Gordo General Winfield Scott, marching on Mexico City, met and defeated a
Mexican force of about 13,000.
1847- Peace negotiations with Mexico were initiated through the British minister, Charles
1847- At Churubusco General Winfield Scott defeated a Mexican army of 20,000.
1847- At the Battle of Molino del Rey U.S. forces under General Winfield Scott defeated
an estimated 12,000 Mexicans.
1848- The Treaty of Guadalupe Hidalgo, signed by the U.S. and Mexico on February 2, 1848,
formally ended the Mexican War (1846-1848). By the terms Mexico recobnized Texas as part of the U.S. and ceded to the U.S.
over 500,000 square miles of territory, including all of the future states of California, Nevada, and Utah, almost all of
New Mexico and Arizona, and parts of Colorado and Wyoming. In return the U.S. agreed to pay Mexico $15,000,000 and to assume
the claims of U.S. citizens against Mexico, amounting to $3,250,000. The U.S. became an enormous continental republic, but
the acquisition of the new territory aggravated the dispute between slavery and antislavery forces. The war resulted in 1721
dead and 4102 wounded. In addition, some 11,155 Americans died of disease as a result of the war. The total cost of the war
was estimated at $97,500,000.