The war with Mexico refers to the armed conflict that took place between the United States and Mexico from 1846 to 1848. It was primarily fought over territorial disputes, specifically regarding Texas and the border region.
Related terms
Manifest Destiny: The belief held by many Americans in the 19th century that it was their destiny and right to expand westward across the continent.
Treaty of Guadalupe Hidalgo: The peace treaty signed between the United States and Mexico in 1848, which ended the war and ceded a significant amount of territory to the United States.
Mexican Cession: The name given to the vast territory that Mexico had to cede to the United States as part of the Treaty of Guadalupe Hidalgo, including present-day California, Nevada, Utah, Arizona, New Mexico, and parts of Colorado and Wyoming.