A union victory refers to a successful military engagement by the Union forces during the American Civil War, marking a significant achievement in their efforts to preserve the nation and end slavery. These victories played a crucial role in boosting morale, securing strategic advantages, and shaping the course of the war, particularly in pivotal battles like those that occurred in New Mexico, including the Battle of Glorieta Pass. Ultimately, these victories contributed to the eventual defeat of the Confederacy and the preservation of the United States as a unified nation.