In the spring of 1846 James K. Polk announced that the Mexican Army had invaded United States territory and had "shed American blood upon the American soil." This political rhetoric, as Glenn W. Price establishes in Origins of the War with Mexico: The Polk-Stockton Intrigue, is part of the myth of American innocence. It represents the "internal contradiction between professed values and patterns of action," perpetuated by American historical writing that emphasizes national consequences of the acquisition of foreign territory and minimizes both its international significance and the...