Final answer:
The D-Day invasion contributed to the Allies' victory by diverting German forces, relieving pressure on the Soviet Union, and establishing a foothold in Western Europe.
Step-by-step explanation:
The D-Day invasion, which took place on June 6, 1944, contributed significantly to the Allies' victory in World War II. The invasion involved the landing of over 150,000 troops from the United States, Britain, and Canada on the beaches of Normandy in France. It played a crucial role in diverting German forces from the eastern front and relieving pressure on the Soviet Union's troops. Additionally, the successful capture of Normandy allowed the Allies to establish a foothold in Western Europe and eventually liberate Paris.