D-Day had a great effect on the outcome of World War II. If the Russians could capture half of Germany with an Allied success at D-Day, then it is possible that an Allied loss at D-Day could have allowed the Russians to capture most of Germany. Therefore, an Allied loss at D-Day could have had a great impact on the Cold War. Also, if the Allies had failed at D-Day, to plan another invasion and to get the manpower to do so would have been exceptionally hard. Allied morale would have been low, and Russia, seeing that its Allies were weak, may have even abandoned the Allies and made a separate peace with Germany, as they had done in World War I. All of these scenarios could have happened had D-Day failed. The D-Day Invasion of Normandy is a great part of American history that has had a great impact on the world in which we live in today.
This is an interesting article of BBC telling us what could have happe if D-Day didn't had the succes it had