Collection: Mexican American War
Mexican American War — Service Under a Divided Flag, 1846–1848
The Mexican-American War was one of the most controversial conflicts in American history — a war of territorial expansion that deepened the national debate over slavery. Yet African Americans served in this conflict, navigating the profound contradiction of fighting for a nation that denied them basic rights, in a war that would ultimately expand the territory where slavery could spread.
Service & Participation
- U.S. Army regulars — Black soldiers served in support and labor roles throughout the conflict, as the Army had not yet formally organized Black combat units
- Buffalo Soldiers precursor — many of the men who would go on to form the legendary Buffalo Soldier regiments after the Civil War gained their first military experience during this era
- San Patricio Battalion — notably, some Black soldiers and Irish immigrants defected to the Mexican side, forming the San Patricio Battalion, a reflection of the deep moral tensions of the war
- Free Black sailors — continued to serve in the U.S. Navy in significant numbers throughout the conflict
The Deeper Stakes
The outcome of the Mexican-American War — and the vast territories it added to the United States — directly intensified the sectional crisis over slavery that would lead to the Civil War just over a decade later. Black Americans understood these stakes better than anyone.
Our Mexican American War collection honors the complexity of service in an era when the meaning of freedom itself was being contested.
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