How did the allied powers win the war?

The Allied Powers won World War II through a combination of military strategy, industrial strength, and effective collaboration among nations. Key victories in battles such as Stalingrad and D-Day shifted momentum in favor of the Allies, while extensive resources from the U.S. bolstered their war efforts. Additionally, the Allies utilized intelligence and technology advancements, including code-breaking and air superiority, to outmaneuver Axis forces. Ultimately, the coordinated efforts led to the downfall of Nazi Germany and Japan, culminating in their unconditional surrender.