During which event did the Big Three leaders agree to discuss territorial divisions after Victory in Europe?

The correct answer is the Potsdam Conference. This event, held in July and August of 1945, was a crucial meeting among the leaders of the Allied powers—President Harry S. Truman of the United States, Prime Minister Winston Churchill (and later Clement Attlee) of the United Kingdom, and Premier Joseph Stalin of the Soviet Union. The primary focus of the conference was to address the post-war order in Europe, including the restructuring of territorial boundaries and the administration of defeated Germany after the Allies' victory in Europe.

The Potsdam Conference followed the earlier Yalta Conference, which also dealt with post-war reconstruction but was held while the war was still ongoing in Europe. At Yalta, the leaders agreed on certain principles for dividing Europe and establishing spheres of influence, but much of the detailed planning was left to be finalized at Potsdam, where specific territorial divisions were discussed.

In contrast, the Geneva Conference and the Strategic Bombing Conference do not pertain to the agreements made regarding territorial divisions in Europe following World War II. The Geneva Conference was related to issues like the Indochina War and the broader scope of international peace negotiations, while the Strategic Bombing Conference focused more on military strategy than post-war political arrangements. Thus, the Potsdam