The Allies think they are finding a way to win the war.
Axis strategy has been to divide enemy forces and demolish them fragment by fragment. Allied strategy, which became obvious the moment the Americas fell into the war, is to prevent any further division. The Allies, possessing the great land masses of the world and the great sea bastions between them, must temper their chain and let no link be broken. Then, with unified, coordinated action, they must use the chain to beat the enemy down.
Fittingly enough, the strategy of unity was first proposed by the first victim of Axis...