The United States–Mexico War was the first war in which the United States engaged in a conflict with a foreign nation for the purpose of conquest. It was also the first conflict in which trained soldiers (from West Point) played a large role. The war’s end transformed the United States into a continental nation as it acquired a vast portion of Mexico’s northern territories. In addition to shaping U.S.–Mexico relations into the present, the conflict also led to the forcible incorporation of Mexicans (who became Mexican Americans) as the nation’s first Latinos. Yet, the war has been identified as the nation’s “forgotten war” because few Americans know the causes and consequences of this conflict. Within fifteen years of the war’s end, the conflict faded from popular memory, but it did not disappear, due to the outbreak of the U.S. Civil War. By contrast, the U.S.–Mexico War is prominently remembered in Mexico as having caused the loss of half of the nation’s territory, and as an event that continues to shape Mexico’s relationship with the United States. Official memories (or national histories) of war affect international relations, and also shape how each nation’s population views citizens of other countries. Not surprisingly, there is a stark difference in the ways that American citizens and Mexican citizens remember and forget the war (e.g., Americans refer to the “Mexican American War” or the “U.S.–Mexican War,” for example, while Mexicans identify the conflict as the “War of North American Intervention”).