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@evan I picked "Japanese Invasion of China" but slightly partial to 1931 instance as first major post-WWI invasion and end of League of Nations credibility.

But consensus (including this poll) of German invasion of Poland is pretty reasonable as point of no return in hindsight, and when term WWII began to be used at the time.

Tho also sympathetic to WWI never ended view. Synthesis: WWII began with the Russian Civil War (ideological component much more salient from that point on).