What Treaty ended WW2?

Answer 1

The Potsdam Declaration demanded unconditional surrender by Japan and Germany. They did sign unconditional surrenders and allowed the allied forces to occupy those two nations but there was no treaty like the treaty of Versailles in World War 1.

There were many smaller treaties that were not world wide treaties during the war. There are too many to list here so I have provided a link for you to continue your research on treaties in World War 2. Pay attention to the non-aggression pacts. See below
== == Germany and Japan had to surrender unconditionally. This ended the fighting and provided the basis for an interim settlement. The Allies also issued declarations in 1947 to the effect that they were no longer at war. There was a peace treaty between the U.S. and Japan in 1951. In the case of Germany, the Cold War division of the country between West and East made a conventional peace treaty impossible. In 1990, however, there was something akin to a peace treaty in order to regularize Germany's position before re-unification and to tie up various 'loose ends'.