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


  • Rear Admiral Samuel Phillips Lee (USA) (c.1812 - 1897)
    Samuel Phillips Lee (13 February 1812 – 7 June 1897) was a Rear Admiral of the United States Navy. During the US Civil War, he commanded the North Atlantic Blockading Squadron from 4 September...
  • Brig. General James Morrison Hawes (CSA) (1824 - 1889)
    James Morrison Hawes (January 7, 1824 – November 22, 1889) was a brigadier general in the Confederate States Army during the American Civil War. Early life James M. Hawes was born in Lexin...
  • David Thomson (1775 - 1861)
    Thomson was a Major in War of 1812 and a Colonel then General in the Mexican War. Husband of Betsy.
  • Manlius Valerius Thomson (1802 - 1850)
    Manlius Valerius Thomson (August 12, 1802 – July 22, 1850) was a lawyer and politician from the U.S. state of Kentucky. From 1840 to 1844, he served as the 11th Lieutenant Governor of Kentuc...
  • John Calvin Mason (1802 - 1865)
    John Calvin Mason (August 4, 1802 – 1865) was a U.S. Representative from Kentucky. Born near Mount Sterling, Kentucky, Mason attended country and city schools in Montgomery County and Mount ...

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