This episode explores the causes, course, and consequences of the Mexican-American War (1846–1848), one of the most controversial conflicts in U.S. history. Fueled by the belief in Manifest Destiny, the U.S. invaded Mexico after a border dispute, leading to fierce battles and the occupation of Mexico City.

While the U.S. emerged victorious and gained vast territories through the Treaty of Guadalupe Hidalgo, the war sparked internal division, intensified the slavery debate, and left a lasting scar on Mexico. Voices from both soldiers and civilians reveal a deeper moral complexity, raising questions about national ambition and the price of expansion.