Because the southern states felt that the government was taking too many liberties with their rights to rule themselves. Slavery only sparked the decision to secede as it was starting to be a burden with the invention of synthetic cotton in England and was going to be eliminated anyway. Tensions over Business Taxes were already being debated before slavery.
US Civil War
yes
Gettysburg
antietam
Civil War
Palmito Ranch, Texas
Gettysburg
1861-65
Gettysburg.
Surgery in the American Civil War could take place either in a hospital or in a battlefield hospital; more rudimentary, disease ridden "hospitals".
April 1861 - April 1865
The Civil war took place in the years 1861-1865
The story take place during the American Civil War.
Gettysburg
The American civil war didn't take place until 1861 so your dates do not apply.
The civil war mainly took place in southern states.
The Civil War just didn't take place at Gettysburg. There were many other places.
That would have been the battle at Gettysburg.