Mexican-American War

The Mexican-American War (1846-1848) is a pivotal event in the histories of both Mexico and the United States. This conflict not only reshaped the borders of North America but also set the stage for future relations between the two nations. The war was sparked by the U.S. annexation of Texas in 1845 and a dispute over the location of the Texas-Mexico border. The U.S. claimed the border was at the Rio Grande River, while Mexico claimed it was at the Nueces River. ** Please note that historical materials may include viewpoints and values that are not consistent with the values of the California State Library or the State of California and may be considered offensive. Materials must be viewed in the context of the relevant time period, but views are in no way endorsed by the State Library. The California State Library’s mission is to provide credible information services to all Californians and, as such, the content of historical materials should be transcribed as it appears in the original document.