if one nation takes over the whole map and you draw a expand card there is no more territory to expand to and the game is unplayable. For example, I had 2 main nations in the Mediterranean Map, the Ottomans and Romans, I drew a Union Card making the Roman Empire the only nation on the map and then drew a large expand with no where to expand. Easy fix is when there is less territory than draw power, only allow splits or new nation card.