Why is D-day considered a turning point in world war 2?

D Day began the liberation of France. It signalled the end of the Nazi domination of Western Europe. It also made sure that the Germans now had to fight against both the British & US in the West & in Italy as well as the Russians in the East.It was very important to WW II
Because America had entered the war in Europe. From then on it was the U.S. pushing the enemy back. Instead of the other way around.