CivEx or Civilization Experiment is an experimental political minecraft server exploring the interactions between nation-states. It has taken various forms since its inception in 2014 with a post on the Minecraft subreddit. While the CivEx community is currently inactive, it has had a large effect on the formation of Reconstruction Era.
The first version of CivEx was inspired somewhat from Civcraft, but saw many people who were new to civ servers.
Civex 2.0 was brought about in a hurry due to 1.0 getting nuked.
The third version of civex was pretty short-lived.