The main goal of the Allied Powers in World War II was to defeat the Axis Powers and restore peace globally. This involved military cooperation and strategic alliances among nations such as the United States, the Soviet Union, and the United Kingdom. The Allies aimed to liberate territories occupied by Axis forces and halt the expansionist policies of countries like Germany and Japan. Ultimately, the Allies sought to create a new world order based on principles of democracy and self-determination, leading to the establishment of the United Nations post-war.