Virginia was a Confederate state. The Union slave states were Maryland, Delaware, Missouri, and Kentucky. In June 1863 West Virginia became the fifth Union slave state.
confederate state
Do you mean the five slave-states that stayed in the Union? There were origially four - Missouri, Kentucky, Maryland and Delaware. A fifth was the newly-created state of West Virginia, which broke away from the Confederate state of Virginia in 1863.
That could be Kentucky or Missouri, which both had three borders with free-soil states. But they had also stayed in the Union, as 'buffer states' that had voted against joining he Confederacy.
Maryland, Delaware, Missouri, and Kentucky
Most slave states left the union. The "border" states that practiced slavery, but stayed in the union, probably realized it would be too difficult to fight off the North.
There were five slave states that remained in the Union. Initially there were four -- Delaware, Maryland, Kentucky and Missouri. West Virgina separated from Virginia when it (Virginia) seceded from the Union. West Virginia was admitted to the Union in 1863 as a slave state. West Virgina remained in the Union making it the fifth slave state not to secede. These five slave states were called border states.
The northern states did want Missouri admitted to the union as a slave state so as to balance the free slave trade.
The states that were in secession; formed the Confederate States of America. Those states that did not, stayed with the Union. West Virgina broke off from Virginia and stayed with the Union and became a state. It was very simple. Either a state was with the CSA or the Union.
California became a free state in 1850, ending the balance of free states and slave states. However, the slave states got a tougher fugitive slave law as a result of California's admission to the Union as a free state.
West Virginia broke apart from the slave state Virginia and joined the Union, but for the most part all slave states were Confederate.
The five slave states that did not secede from the U.S. were called "border states." These states are West Virginia, Missouri, Kentucky, Maryland and Delaware.