<P> In the context of the American Civil War ( 1861 -- 65 ) , the border states were slave states that did not declare a secession from the Union and did not join the Confederacy . To their north they bordered free states of the Union and to their south they bordered Confederate slave states . Of the 34 U.S. states in 1861 , nineteen were free states and fifteen were slave states . Four slave states never declared a secession : Delaware , Kentucky , Maryland , and Missouri . Four others did not declare secession until after the Battle of Fort Sumter and were briefly considered to be border states : Arkansas , North Carolina , Tennessee , and Virginia -- after this , they were less frequently called `` border states '' . Also included as a border state during the war is West Virginia , which was formed from 50 counties of Virginia and became a new state in the Union in 1863 . </P>
<P> In the context of the American Civil War ( 1861 -- 65 ) , the border states were slave states that did not declare a secession from the Union and did not join the Confederacy . To their north they bordered free states of the Union and to their south they bordered Confederate slave states . Of the 34 U.S. states in 1861 , nineteen were free states and fifteen were slave states . Four slave states never declared a secession : Delaware , Kentucky , Maryland , and Missouri . Four others did not declare secession until after the Battle of Fort Sumter and were briefly considered to be border states : Arkansas , North Carolina , Tennessee , and Virginia -- after this , they were less frequently called `` border states '' . Also included as a border state during the war is West Virginia , which was formed from 50 counties of Virginia and became a new state in the Union in 1863 . </P>
what was a slave state that remained in the union called
what was a slave state that remained in the union called
Delaware Kentucky Maryland Missouri
Delaware Kentucky Maryland Missouri