Lectures in History

The Mexican-American War: Causes, Consequences, and Legacy

Nov 1, 2025
Aaron O'Connell, a history professor at the University of Texas, delves into the Mexican-American War's intricate dynamics. He explores how geopolitical shifts, domestic pressures, and partisan politics stoked conflicts. O'Connell examines tactical innovations like flying artillery and the impact of military leadership choices. He also discusses the war's devastating consequences, from territorial gains to the challenging realities faced by newly incorporated Mexican citizens, all while reflecting on the war's legacy and historical memory.
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INSIGHT

Spark Plus Powder Explains War

  • Wars need a spark plus existing "gunpowder" like geopolitical, economic, or cultural pressures to explode.
  • Aaron O'Connell frames the Mexican-American War as spark(s) igniting long-standing structural weaknesses in Mexico and expansionist pressures in the U.S.
INSIGHT

Mexico's Weakness Was Structural

  • Mexico's post-independence weakness made it vulnerable to U.S. ambitions and intervention.
  • O'Connell links Spain's imperial collapse and Mexico's political fragmentation to its inability to defend territory.
INSIGHT

Manifest Destiny Had Racial Religion Roots

  • Manifest Destiny combined expansionism with racial and religious rhetoric to justify conquest.
  • O'Connell emphasizes the Anglo-Saxon, anti-Catholic framing used to legitimize taking Mexican lands.
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