The leaders of the World War Two era and why they were fighting in the war is interesting because some of them had different opinions, like Adolf Hitler invading Poland because he wanted to expand Germany and the Aryan race or The 33rd American President Harry S. Truman. Truman being the ultimate deciders of the the atomic bomb.
World War Two was the largest war in history and it had the most casualties. It all started when Nazi Germany invaded Poland in 1939 by command of Adolf Hitler, and the war went until 1945 when America decided to launch the first atomic bomb on Japan in Hiroshima and Nagasaki after that the Japanese surrendered to USA. The war claimed around 80 million lives, 55 million being citizens and 6 million being Jews. Therefore, earning its title the biggest and deadliest war in history.