Important people in this event are: Zachary Taylor, Santa Anna, and General Winfield Scott. This war began after Texas was granted freedom from Spain, but Mexico refused to recognize it. The US, however, tried to stay out of the conflict but that ended when Mexico would not let them purchase Texas. The Mexican war helped lead to the Civil war, because it started conflicts about slavery and whether or not it would happen in Texas. The US tried to pass Acts to resolve this conflict, but at the end of all the conflict, Texas became a slave state.