Answer:
DDay helped the Allied Forces strengthen their position in Axis territories. Due to DDay the Axis Forces started to fall apart as the invasion took a huge toll on their resources and the Axis's War Machine. This contributed to a long spiral of the Nazi's Wehrmacht falling apart and to the eventual close of World War II.
Step-by-step explanation:
How I got these answers was from studying World War II For a long time. Hopefully this is the answer you were looking for and if not I am sorry.