Well Grievous estimates at being about the size of Spain is off, as I said earlier. So there may need to be a revision to downsize that, or at least complicate the politic of the state more. The larger something gets the more ethnic groups it takes in which don't often act happy to their overlord.

It's more the size of India which was only really united once before the British Raj, as far as I can remember. Though a warlike nation would certainly explain it.