I think Nationalism should be benefited to conquer the land with the same race. E.G. Italy countries (Genoa/Venice/Sicily) (may be the first who find the technology??) would claim the whole italy land to historical and can invade the Rome (Yes, I always find a reason to invade the Rome) German/Austria/Prussia is the same case. It reflect the reunification of this two country. I know that it may be little earlier than the history, but as least they should be allowed to have concept of reunification.