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One of the reasons why the Battle of Gettysburg was a turning point in the Civil War is because "The battle weakened Lee and stopped his invasion," although it also led both sides to reevaluate their positions.Â
The Battle of Gettysburg was a turning point in the Civil War because it  weakened Lee and stopped his invasion. Option C is correct.
The battle of Gettysburg is regarded as the turning point of the Civil War. Gen. Robert E. Lee's defeat by the Army of the Potomac compelled his Confederate forces to retreat and they never recovered.
The Battle of Gettysburg took place July 1–3, 1863, in and around the town of Gettysburg, Pennsylvania, by Union and Confederate forces during the American Civil War.