The war in Europe started on September 1st 1939 when German troops invaded Poland and France and England declared war on Germany. But it wasn't a "World" war until the Japanese attacked Pearl Harbor on Dec. 7th 1941. Then it actually became a world war as many more nations around the world became involved.

The war in Europe started on September 1st 1939 when German troops invaded Poland and France and England declared war on Germany. But it wasn't a "World" war until the Japanese attacked Pearl Harbor on Dec. 7th 1941. Then it actually became a world war as many more nations around the world became involved.