Well there are several reasons to why the Allies won and the Axis lost. One of the most obvious resons, is the invovations such as radar, the atomic bomb, Incidenaries, etc. Of cousre the The axis had their own inovations, such as the V rockets, the jet propsioned engine. However, these Axis advancements wouldn't change the course of the war do to the fact that the Axis had basic the entire world against them. And very few countries can support themselves let alone a secusful war effort. The Axis had only the resaech and resources it could gather within its borders.
Another factor was simply the East. If the Germans were not so greedy with its intital sweep into the Soveit Union it may have completely crushed all resistance in all of Europe and could of conquered a great majority over Africa. However, if you looked from the Soveit veiw of the war, all of their neiboring countries would have fallen. Having be completly surrounded by the Nazis and Japanese, the over one Million soldiers of the Red Army would have been easily been token over by the two joining forces.
Also a great factor was distance. Imagine how hard it was for Axis allies to keep in touch such as Nazi Germany and Japan? The War could have been much differnt if the Axis was completely joined such as if they were linked together as one nation instead of being seperated by several countries.