Final answer:
The invasion of Western Europe, or D-Day, succeeded due to strategic planning and execution by the Allies, the diversion of German forces, and the weakening of German defense through previous conflicts.
Step-by-step explanation:
The invasion of Western Europe, or D-Day, was a major turning point in World War II and it succeeded due to a number of factors. The Allies utilized strategic plans, performed well in combat, and coordination among the Allies also played a key role. Prior to D-Day, the Allies had also effectively worn down German forces through previous invasions and conflicts.
To launch an assault on Nazi Germany's 'Fortress Europe', the Allies stormed the beaches of northern France on June 6, 1944; it was a massive operation involving British, Canadian, and American troops. Once the beachheads at Normandy were established, it took months of difficult fighting before Paris was liberated on August 20, 1944. This invasion successfully diverted German forces from the eastern front to the western front, relieving pressure on Stalin's troops.
An important strategic opportunity arose when the Germans, expecting an invasion, divided their forces, retaining larger numbers on the Eastern Front to counter Soviets and assigning fewer forces for Europe's defence. This further made the invasion of Western Europe a success. Furthermore, they had suffered major losses in what proved to be their final European offensive, allowing the Allied forces to gain a stronger foothold.
Learn more about Invasion of Western Europe