The formal cause of the Mexican-American war was a dispute about the Western boundary of the Republic of Texas which the United States had annexed in March 1845, causing a formal rupture in diplomatic relations. The deeper cause was the frustration which Mexico had been expressing for 20 years about the encroachment of United States settlers into its territory, and in particular their colonisation of Texas, and the manifestly expansionist policies of President James K. Polk.
Polk's offer to purchase New Mexico and California in the winter of 1845 was rebuffed by the Mexican president, José Joaquín Herrera, so Polk orderd General Zachary Taylor to advance across the river Nueces, which the Mexicans considered the Texan …
254 words
Citation: Editors, Litencyc. "Mexican-American War". The Literary Encyclopedia. First published 22 December 2007 [https://staging.litencyc.com/php/stopics.php?rec=true&UID=4894, accessed 23 November 2024.]