Lousiana, Florida, and South Carolina
Kentucky and Maryland. There was also Delaware (not sure if that one bordered Virginia!)
union + rebel
the Union, United States, Yankees, North
The Confederate States of America or Confederacy
During the US Civil War, the mutual combatants' armies were named the Union Army and the Confederate States Army.
gettysburg
There were no neutral states. The Border States would have liked to be neutral, but became the biggest battlegrounds. Some of the western states were able to avoid too much involvement, but still provided troops and goods to both sides.
Missouri, Kentucky, and Maryland all border Confederate states.
Missouri, Kentucky, and Maryland all border Confederate states.
Missouri, Kentucky, and Maryland all border Confederate states.
Assuming that you mean the Civil War that took place in the United States - two alternate names are The War Between the States, and the The War of Northern Agression.