What would happen if D- Day invasion had not been successful?

If the D-Day invasion had not been successful, the timeline of World War II would likely have shifted dramatically. The Allies would have faced a longer and more arduous struggle to liberate Western Europe, potentially allowing Nazi Germany to consolidate its power and prolong the war. This failure could have also weakened Allied morale, emboldened Axis powers, and altered post-war geopolitical dynamics, possibly leading to a stronger Soviet influence in Europe. Ultimately, the outcome of the war and the subsequent global order would have been profoundly different.