The document summarizes key figures and events of World War II. The Big Three leaders, Franklin D. Roosevelt, Joseph Stalin, and Winston Churchill, united the Allies against the Axis Powers led by Adolf Hitler of Germany, Benito Mussolini of Italy, and Hideki Tojo of Japan. After Germany surrendered in May 1945, the U.S. dropped atomic bombs on Hiroshima and Nagasaki, leading Japan to surrender on September 2, 1945 and ending World War II, with the U.S. and Soviet Union emerging as superpowers.