Today in history: The beginning of the Mexican-American War

In 1846, President James Polk approved a controversial declaration of war

Gen. Zachary Taylor in 1847, directing his troops at the Battle of Buena Vista in Northern Mexico during the Mexican-American War.
(Image credit: Hulton Archive/Getty Images)

May 13, 1846: At President James K. Polk's urging, Congress approved a declaration of war against Mexico. The war would end in 1848 with the United States gaining 525,000 square miles of land, including what is now Texas, California, Nevada, Utah, New Mexico, Arizona, and parts of Colorado and Wyoming.

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