I cannot believe World War II began in 39 and ended in 45. This is completely non-sensical. What is the criteria for determining the start and stop? The only conditions that make any sense at all are:
- The date when all participants finally engaged in hostilities
- The date when the first participant engaged in hostilities
For the sake of simplicity, I'll stick to Axis timelines as the Allies were only an answer to the Axis and because of the everchanging roster of Allies. If everything aforementioned is to be held true, World War II either lasted from when Germany invaded Poland to the Italian surrender, or from the beginning of the Second Sino-Japanese War to the Japanese surrender.