..."order to serve injustice and oppression, does not pay at all, for it does not even receive the applause of history."
This point qualifies as a biased source material. The Mexican History author distillate his own perspective about the outcome of the war. Judging by his declaration of Mexican heritage, (... not only for our country...) the author gives a very uncomfortable, and furious opinion about the American action during this war, and in the end makes a huge generalization about the viewpoint of other authors about this war. Mexican War resulted from the Annexation of Texas, declared by a joint resolution of Congress in 1845, infuriated Mexico. The newly elected president, James K. Polk, sought to acquire California and New Mexico as well as Texas, but negotiations soon failed. When Mexican troops crossed the Rio Grande, Polk urged Congress to declare war.