The document discusses the justification of the Mexican-American War between the United States and Mexico in 1845-1848. It argues that the U.S. was not justified in going to war for three key reasons: 1) The U.S. was land hungry and wanted to expand Texas's borders into Mexican territory; 2) U.S. settlers were acting as lawbreakers by stealing Mexican land and territories; 3) The U.S. actions, such as land seizures, were essentially robbery against Mexico. Overall, the document makes the case that while the U.S. may have had political motivations, its conduct in the run-up and during the war was unjustified.