World War II :

The global war that lasted from 1939 to 1945 involving the vast majority of the world's nations forming two opposing military alliances: the Allies and the Axis. It was the most widespread war in history, and directly involved more than 100 million people from over 30 countries. In a state of "total war", the major participants threw their entire economic, industrial, and scientific capabilities behind the war effort, erasing the distinction between civilian and military resources. Marked by mass deaths of civilians, including the Holocaust and the strategic bombing of industrial and population centres , it resulted in an estimated 50 million to 85 million fatalities. These made World War II the deadliest conflict in human history.