Why and how was D-Day a major turning point in World War 2?

Answer 1

It opened a second front against Hitlers Germany, taking some pressure off of the Red army, allowing them to make faster inroads into Germany. It allowed the full force (not just air power) of the US and Britain to engage the enemy, bringing them to total destruction. Answer It isn't by all, and it should also be remembered that D-Day is primarily important just for the European Theater of Operations, though certainly it did have ramifications for the war in the Pacific. Previous attempts at creating a second front in Italy and North Africa, though successful in driving out the Germans (albeit very slowly and costly in Italy) had failed to divert a significant amount of Wehrmacht forces from the Eastern Front where the most brutal and vast majority of the fighting in the European Theater was going on (actually, most people would probably say the turning point of the war was the Battle of Stalingrad). The invasion of Northern, and subsequent invasion of Southern France forced the Wehrmacht to take the American/British/French threat seriously and divert large forces to guarding their Western frontiers, which of course made defending themselves against the oncoming Soviet hoards basically impossible.