The significance of the Atlantic Charter during World War II lies in its establishment of a set of principles guiding the Allied nations in their wartime efforts and post-war vision. Drafted by U.S. President Franklin D. Roosevelt and British Prime Minister Winston Churchill in August 1941, the Charter outlined eight common principles, including the right to self-determination, economic cooperation, and the quest for lasting peace. It served as a foundation for the United Nations and mirrored the Allies' commitment to fighting against Axis powers. The Atlantic Charter represented a united front for democratic ideals and laid the groundwork for the post-war order.