Why is the battle of gettysburg called the turning point of the civil war

The Battle of Gettysburg was one of the bloodiest battles of the Civil War and has been regarded as the turning point in the war as it started the Union's series of victories in the southern states that finally ended the war in 1865. It took place in the city of Gettysburg, Pennsylvania between July 1 and July 3, 1863, and was an important Union victory.

During the three days the battle lasted, approximately 50,000 men were killed and approximately 15,000 were injured, thus making the battle the one with the greatest casualties during the Civil War.