Answer:
Battle of Gettysburg
Explanation:
The Battle of Gettysburg is considered the turning point of the civil war because it was a great victory for the Union. It lasted 3 days and took place in Gettysburg, VA. After the battle, the South lost the hope of receiving supplies from France and Great Britain, which was a big loss for the Confederacy.
The Battle started because the Confederacy army was starting to go up North to DC and the Union was able to block it.