Whoever suggested Classical should be post-prehistoric to 500 AD, I'm glaring at you for a name choice that's both terrible and inappropriate.
To be honest, if we end up with a pre-Westphalia post-Westphalia, and post-1900 forum we'll end up having the same discussion all over again, probably with the post-Westphalia bunch complaining about the billion ACW threads. People are arguing for the split for reasons of organisation and clarity, but near dead forums are one of the worst things to have on a forum and at least one community created out of a split would get screwed over like that.
The most important reason for having additional areas on a forum must always be having the activity to justify it. Pre-1900 does not have enough people to create multiple sustainable communities to my knowledge.
To be honest, if we end up with a pre-Westphalia post-Westphalia, and post-1900 forum we'll end up having the same discussion all over again, probably with the post-Westphalia bunch complaining about the billion ACW threads. People are arguing for the split for reasons of organisation and clarity, but near dead forums are one of the worst things to have on a forum and at least one community created out of a split would get screwed over like that.
The most important reason for having additional areas on a forum must always be having the activity to justify it. Pre-1900 does not have enough people to create multiple sustainable communities to my knowledge.