Michael's Earth 5E
Mystery Magic Number: 605,895,995,773.
Lots of old information about the setting is on the 2E site.
This Earth has had 17 tactical nukes launched in a little over 100 years, when 2/3 of cultures don’t know about steel yet.
Aziza’s Plan (see here) pushed the plot on alt timeline 1, and Prism called the shot to force the game to alt timeline 2.
Allo or CSAEA or Lhane?