What Happened in the Second World War

World War II was a global military conflict which took place between 1939 and 1945  . --It involved most of the world's nations. It was the largest military conflict in history ", the major participants placed their entire economic, military and scientific capabilities at the service of the war effort, erasing the distinction between resources civil and military. Marked by events of great significance that included the mass death of civilians, the Holocaust and the use for the first and only time, nuclear weapons in a military conflict, World War II was the deadliest --conflict in human history with a final score 70 million victims.