Graphic title: Major Battles of the Civil War. The graphic shows a map of the eastern United States and a table listing the major battles of the Civil War and the number of casualties (Union and Confederate) in each battle. For the map, the following states are shown as Confederate states: Texas, Louisiana, Arkansas, Mississippi, Alabama, Florida, Georgia, Tennessee, South and North Carolina, and Virginia. The following states are shown to be border states: Missouri, Kentucky, Delaware, and Maryland. The following states are shown as Union states: Kansas, Iowa, Illinois, Indiana, Ohio, West Virginia, Pennsylvania, and New Jersey. The following battles are shown to be Confederate victories: Wilson The Battles of Antietam and Gettysburg resulted in some of the highest casualties of the war. What factor most likely influenced these casualty rates in both battles? Their closeness to the Union capital Their closeness to major seaports Their closeness to Northern trade interests Their closeness to the Confederate capitol