Natural resources: The Allies also had access to more natural resources than the Axis powers. This gave them a significant advantage in terms of producing fuel and other essential supplies.
Geographical advantages: The Allies were also helped by the fact that they controlled the majority of the world's major sea routes. This made it difficult for the Axis powers to transport troops and supplies to their far-flung fronts.
Technological advances: The Allies were also able to take advantage of a number of technological advances, such as the atomic bomb and the radar. These advances gave them a significant edge in the war.
Morale: The Allies also had the advantage of higher morale than the Axis powers. This was due to a number of factors, including the fact that they had a just cause and that they were fighting for their survival.