Video: 'President Polk declares war on Mexico May 13 1846'

(Wednesday, May 13, 1846; during the Mexican-American War) — The U.S. Congress approved a declaration of war on Mexico requested by President James Polk today after a few hours of debate on a vote of 40-2 in the Senate and 174-14 in the House.

Video: 'Mexican-American War Causes Explained: Why the U.S. Declared War in 1846 | 3-Minute History'