Documentary, The Mexican American War of 1846-1848
The Mexican-American War (April 1846–February 1848) was an armed conflict triggered by the U.S. annexation of Texas and disputes over the Texas-Mexico border. Driven by Manifest Destiny, the U.S. victory resulted in a massive territorial expansion, with Mexico ceding over 500,000 square miles (present-day California, Nevada, Utah, and parts of others) under the Treaty of Guadalupe Hidalgo.
Key Aspects of the War:
Causes: The U.S. annexed Texas in 1845, which Mexico still considered its territory. Disputes over whether Texas’s southern border was the Nueces River or the Rio Grande led to the "Thornton Affair," where Mexican forces attacked U.S. troops in the disputed area, prompting a U.S. declaration of war in May 1846.
Major Conflict Areas: The U.S. initiated a multi-pronged invasion, including campaigns in Northern Mexico led by Zachary Taylor, the occupation of California, and a final push to Mexico City led by Winfield Scott.
Outcome: The Treaty of Guadalupe Hidalgo (signed February 2, 1848) ended the war. Mexico recognized the Rio Grande as its northern border and ceded major territory in exchange for $15 million and the assumption of certain claims.
Significance: The war finalized U.S. expansion to the Pacific coast but heightened intense domestic debate over the expansion of slavery into the new territories.
