I found this ATM10 server called Iperios and it is all about building nations. Players can make their own nation and pick how it is run. You can set up your own government and your own laws and your own ranks.
If you do not want to start from nothing you can just join a nation that already exists. Staff help new players when they join and they give a beginner kit so you are not stuck at the start. The server uses the All the Mods 10 modpack version 5.4 so you need that installed to play.
The server is whitelist so you have to join first and get accepted. After that staff guide you and explain how things work. The whole place feels like it is built around roleplay with rules and nations instead of just random chaos.
Iperios ATM10 Modded Nations RP
GG.MINEWIND.NET New Server IPIperios ATM10 Nations Roleplay
Iperios is a modded server that uses the Allthemods10 ATM10 modpack version 5.4. The cool thing is that you can make your own nation on the server.
You get to choose your government style and set your own laws and ranks. If you do not want to make a nation you can just join one that already exists and play with other people.
To join you first get whitelisted in their discord. After that you get the server info and some starting details in the new player info channel.
When you finally log in a staff member meets you and helps you. They give you a beginner kit and guide you so you can start playing on the world right away.
You need to have the ATM10 modpack installed with version 5.4 or it will not work.GG.MINEWIND.NET New Server IP