The turning point in the Civil War was the Battle of Gettysburg. It's considered so, because this battle stopped the one and only attempted attack in Union territory. It also had boosted the moral of Northerners, making them think they could possibly win the war, which they obviously did.
Gettysburg was not the one and only Northern Incursion. The Maryland Campaign that led to Antietam preceded it. Gettysburg was the last Northern Invasion. [Also, the real turning point was Vicksburg: the closing of the Mississippi to Southern traffic.]
The turning point was not a battle but a siege, the Siege of Vicksburg.
Most historians and scholars believe the turning point of the American Civil War was the Battle of Gettysburg fought in July 1863.
The actual turning point was the fall of Vicksburg at around the same time.
Some historians considered it the turning point, previously, but, majority opinion now considers Vicksburg to be the actual turning point.
Vicksburg
The Battle of Gettysburg.
Gettysburg
Vicksburg
The true turning point of the Civil War was the seizure of Vicksburg, but it was really the result of a siege.
being the turning point of the civil war.
Gettysburg
The Battle of Gettysburg