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Prince$s
You do realize that the Tamils are added to DoC already, right?This is all well and good but:
For example India was never unified until independence, so there's dynamic names like "Indian Mahajanapadas," "Mauryan Empire," "Gupta Empire," etc. Not perfect, but this is Civ IV, not Polity IV.
Other than that you have a good point about the AI. I thought they'd require less effort to improve than adding new full civs but what do I know.