Some historians believe that Germany was ultimately responsible for the war. They argue that Germany's desire for expansion and its aggressive foreign policy made it inevitable that war would happen. Others believe that France and Russia were also to blame, arguing that their desire to contain Germany contributed to the build-up of tensions between the powers. Finally, some historians argue that all of the great powers were responsible for the war, as they all contributed to the system of alliances and armaments that made war inevitable.
Ultimately, the question of who was to blame for World War I is a complex one, and there is no simple answer. The war was the result of many factors, and it is difficult to say definitively who was ultimately responsible.