World War II was the most destructive war in history, lasting from 1939 to 1945. Key events included Germany invading Poland in 1939, drawing Britain and France into the war against Germany and Italy (the Axis powers). The Soviet Union and United States later joined the Allies in fighting the Axis. Over 60 million people were killed worldwide before the Axis surrendered in 1945, with the USSR, Germany, China and Japan experiencing the highest losses. The war ended with Allied victory and established the US and USSR as global superpowers.