The Encyclopedia of the Mexican-American War: A Political, Social, and Military History provides an in-depth examination of not only the military conflict itself, but also the impact of the war on both nations; and how this conflict was the first waged by Americans on foreign soil and served to establish critical U.S. military, political, and foreign policy precedents. The entries analyze the Mexican-American War from both the American and Mexican perspectives, in equal measure. In addition to discussing the various campaigns, battles, weapons systems, and other aspects of military history, the three-volume work also contextualizes the conflict within its social, cultural, political, and economic milieu, and places the Mexican-American War into its proper historical and historiographical contexts by covering the eras both before and after the war. This information is particularly critical for students of American history because the conflict fomented sectional conflict in the United States, which resulted in the U.S. Civil War.