This mod was designed for the minecraft server GeoMC it adds a full economy with auction house daily balence etc. plus a nations system with ftbchunks players can declare war and fight it out or settle through peace conference (similar to Hearts of iron). winners of the war can determine what they wanna gain maybe its annex terrioetry claimed through ftbchunks, or take money. set tariffs on other players nations or even sanction nations you dont want your citizens trading with them.
check out the full guide on how to use the mod here https://docs.google.com/document/Capital_and_war
join the minecraftr server that features this mod here https://discord.gg/CCmyrKWXf
use the mod if it works for your needs requires:
FTbchunks teams and library (recomened but not required ftbranks)
architectury api