World War II

World War II or the Second World War, often abbreviated as WWII or WW2, was a global conflict that lasted from 1939 to 1945. The vast majority of the world's countries, including all of the great powers, fought as part of two opposing military alliances: the Allies and the Axis. Many participants threw their economic, industrial, and scientific capabilities behind this total war, blurring the distinction between civilian and military resources. Aircraft played a major role, enabling the strategic bombing of population centres and the delivery of the only two nuclear weapons ever used in war. World War II was by far the deadliest conflict in history, resulting in an estimated 70 to 85 million fatalities, mostly among civilians. Tens of millions died due to genocides, starvation, massacres, and disease. In the wake of Axis defeat, Germany, Austria and Japan were occupied, and war crimes tribunals were conducted against German and Japanese leaders.