[quote=Pepperm1nts]The way I have see it (and again, I could be missing something), the war began partly because of the annexation of Belgium.[/quote]

Let's continue down that train of thought, then. If Belgium being reunited with the Netherlands was an event that contributed to the war, then wouldn't the separation of Belgium in the first place also be a contributing factor, since it was the reason that the reunification occurred?

The War of the Eighth Coalition began as a result of resistance to the idea of self-determination and the national will on the part of the Allied powers.

@Pasta: Not a single Prussian entered Belgium until after the Dutch had advanced into Flanders.