What Could of Happened
There would be a simple effect if we were not successful in D-day, Hitler would be ruling ALL of Europe and possible would have successfully killed all of the "undesirables' in the would to meet hist "Master Plan." The world would be much different if this battle did not happen and it would be a world even worse then what it is lie now. Dictatorship would plague the world.
The effects were obvious, D-Day help shape the end of the war and help break the rule that Hitler and the Nazis had in Europe.