If they make factions for European countries, they can determine if a country can go to a Republic or to a monarchy by having a Monarchist faction, a Merchant faction, and a Church faction. The monarchist faction could represent how much power you as a king/queen can exert over your people and it increases along with your prestige and legitimacy. The merchant faction can help you with trade chances and help bail you out in bankruptcy or loans, and also making mercenaries cheaper by helping subsidize. The church faction can show how close the country is to the Papacy and with high influence you could be able to ask for a crusade or excommunication. During the reformation, a Protestant and Calvinist faction could appear to make things interesting in Europe. In the 1700's you could get a Bourgeoisie faction.