World War 2 is the most devastating event in the history of our planet. There is lot that people don't have a deep understanding about it and I feel as they should. World War 2 changed the way we use technology and the way we interact and fulfill life today. After securing the neutrality of the Soviet Union through the August 1939 German-Soviet Pact of nonaggression, Germany started World War II by invading Poland on September 1, 1939. Britain and France responded by declaring war on Germany on September 3. This would lead to some of the most bloody battles to be fought on the planet and to 70 million to be killed. This is how it happened.