I found RevsMC and it is a fresh 18+ Minecraft Java SMP running the ATM10 modpack. It starts with a brand new world and borders that are waiting to be claimed.
The whole vibe is long term survival with politics and progression. People can make factions nations clans or whatever group they want. You can build power and form alliances.
There are shops and a player economy too so trading actually matters. It sounds like the point is to build real history over time and not have the world die after two weeks.
