Start My Family Tree Welcome to Geni, home of the world's largest family tree.
Join Geni to explore your genealogy and family history in the World's Largest Family Tree.

Mexican–American War

« Back to Projects Dashboard

Project Tags

view all


  • George Caldwell, US Congress (1814 - 1866)
    US Congressman, United States Army Officer. Served in the United States Army during the Mexican War, being commissioned Major and Quartermaster of Volunteers on June 26, 1846. On March 3, 1847 he w...
  • State Senator James Ross (1828 - 1889)
    Biography 1828 - 1889 Born in Mifflin County, April 25, 1828, the son of James and Susannah (Satzler) Ross; attended public schools; farmer; member of the state House, 1862; member of McVeytown cou...
  • Gen. James H. Clanton (1827 - 1871)
    Civil War Confederate Brigadier General. He was the son of Nathaniel Holt Clayton and a Miss Clayton. The family settled in Macon County, Alabama in 1835 and that is where he grew up and went to scho...
  • Gen. John Stuart Williams, U.S. Senator (1818 - 1898)
    John Stuart Williams, a Senator from Kentucky; born near Mount Sterling, Montgomery County, Ky., July 10, 1818; attended the common schools; graduated from Miami University, Oxford, Ohio, in 1839; stud...
  • Brevet Brig. General James R. Hugunin (USA) (1818 - 1892)
    Civil War Brevet Brigadier General. Served in the Mexican War and in the Civil War as Major, 12th Ill. Infantry. He was appointed Bvt. Brig. General, US Volunteers for "gallant and meritorious servic...

The Mexican–American War, also known as the First American Intervention, the Mexican War, or the U.S.–Mexican War, was an armed conflict between the United States and Mexico from 1846 to 1848 in the wake of the 1845 U.S. annexation of Texas, which Mexico considered part of its territory despite the 1836 Texas Revolution.

Combat operations lasted a year and a half, from spring 1846 to fall 1847. American forces quickly occupied New Mexico and California, then invaded parts of Northeastern Mexico and Northwest Mexico; meanwhile, the Pacific Squadron conducted a blockade, and took control of several garrisons on the Pacific coast further south in Baja California. After Mexico would still not agree to the cession of its northern territories, another American army captured Mexico City, and the war ended in victory of the U.S.

The Treaty of Guadalupe Hidalgo specified the major consequence of the war: the forced Mexican Cession of the territories of Alta California and New Mexico to the U.S. in exchange for $18 million. In addition, the United States forgave debt owed by the Mexican government to U.S. citizens. Mexico accepted the Rio Grande as its national border, and the loss of Texas.

American territorial expansion to the Pacific coast had been the goal of President James K. Polk, the leader of the Democratic Party. However, the war was highly controversial in the U.S., with the Whig Party and anti-slavery elements strongly opposed. Heavy American casualties and high monetary cost were also criticized. The political aftermath of the war raised the slavery issue in the U.S., leading to intense debates that pointed to civil war; the Compromise of 1850 provided a brief respite.

In Mexico, terminology for the war include (primera) intervención estadounidense en México (United States' (First) Intervention in Mexico), invasión estadounidense a México (The United States' Invasion of Mexico), and guerra del 47 (The War of 1847).

Notable peoples of the Mexican–American War

See: Mexican–American War Project Profiles.

External links