Why do you think they were called border states?

The term "border states" refers to the slave-holding states that were located along the northern border of the Confederacy during the American Civil War, specifically Missouri, Kentucky, Maryland, and Delaware. They were called border states because they were geographically situated on the boundary between the Union and the Confederacy, and they played a crucial role in the conflict due to their strategic locations and divided loyalties. These states had significant economic and political ties to both the North and the South, making their allegiance pivotal for both sides.