Why is d-day considered a major turning point of world war ii?

During the Blitzkrieg, Germany forced all Allied troops out of France. Because of a long time between the Fall of France and D-Day, Germany was able to be Prepared. Due to the Planning and equipment and skill of the Allied forces, they were able to make a successful naval invasion of France. This Led to the Retaking of France, Belgium, and the Western Half of Germany and some of Austria.

They were eliminating problems caused by industrialization, urbanization, immigration, and corruption in government