I think that 6 natiosn are... well... a little bit few...
So I started thinking about my own nations und the MONGOLS are the first one which came up my mind by thinking about their history and the game mechanics... So they start with stronger mounted units and horseback riding. They also may occupie villages to expand and get trade points... Maybe someone will playtest them (we just played them once....). I will post the starting piece of them in the near future (its just one "normal" playing piece of the game on which silk is found in the left upper corner...). Maybe you have also some ideas about new nations?? I would like to read/see them to variate the game... Enjoy!