The more I generate worlds, the more it annoys me that each culture and nation are one-to-one. Even when a civilization conquers other sites, culture seems to instantly change from what I can gather, so practically every entity is a nation-state. I'd suggest separating Cultures and Governments. Each Culture would start with typically 1 settlement, just like the current Entity. Cultures will hold most of the work done by an Entity, such as values, permitted reactions, species, tissue styling, and material usage. However, Governments (not referring to Site Governments, but to the governing body of a nation), will be influenced by cultural values, and be generated in world gen, though perhaps some tags in raw could give a Culture affinity to governmental structures like a [FEUDAL] tag or [CITYSTATES] tag. Governments would handle holdings, nobles, and relations, and could have conflicts with other governments. Hopefully, eventually this could lead to governments crossing cultures, or splitting apart in civil wars. Additionally, it would tie in to the rework of allegiances, where Dwarves could have differing allegiances to their Fortress, Kingdom, and Culture. I think that these features could be implemented alongside the laws and customs, since they both strive to flesh out how entities function.