Interesting way of looking at it. The accepted date for the start of WW2 is Sept. 1, 1939 with the German invasion of Poland. But what about the Re-militarization of the Rhineland ('36), or the Sudetenland (followed by the absorption of all Czechoslovakia)? The forced "Anschluss" with Austria? The Japanese invasion of Manchuria? Their invasion of China?
I wonder how much Hitler's conquest would have been disrupted had France done more than a minor incursion into Germany. What if they'd done a full-bore invasion? There was very little in the way of defenses facing them while the bulk of the Wehrmancht was in Poland. My point is that these were disconnected conflicts until other large powers got involved making it a general world war. That's not quite the same thing as saying France started it, but their alliance with Poland meant that Germany would have to at least plan for a repeat of WW1.
However what I was asked Condor was more about how the France started the war in 1871.