Not particularly. Most of the countries became involved in the conflict when britain and france declared war. Most small european countries became involved through their treaties with the major powers. Thus most of the nations that joined WW2 joined in 39 (especially when you consider the size of the empires which they brought with them).gh0ti said:The Chinese say WW2 started in 1937, and the Russians in 1941. It's pretty Eurocentric to claim a divine right to the 'true' start of WW2.
As for china, why not claim 31 when Japan invaded Manchuria? 37 after the marco polo bridge incident? 38 when the ceasefire broke down? Really, they'd been fighting so long that this conflict can only be seen as part of WW2 when they tie themselves to the british and wider war. Maybe you disagree but that's what makes sense to me.