[incompatible]

It's arguable, WW2 is typically dated from the German invasion of Poland. By then, the war in Asia was already underway with the Japanese fighting in Asia. So with the British Empire, Germans and French and the Soviet Union also starting hostilities, much of the world was at war.

[philwelch]

This is because the history of WW2 is usually told from a Eurocentric perspective. The Soviets weren’t fully involved until 1941 either, since that’s when Germany invaded them.