Advancing to a new era

[oPunchDrunko]

I’m just curious what causes you to advance to a new era? Does it only happen when a Civ has researched the first tech in the next era?

 

[AriochIV]

I think it's based on the aggregate of the advancement of all the civilizations in the game.

 

[Trav'ling Canuck]

I think it's based on the aggregate of the advancement of all the civilizations in the game.

I believe once >50% of civs have reached a new era - either via the tech tree or the civics tree - it starts a 10 turn count down to the end of the current era. There's a minimum number of turns that must pass, however, before the world era changes. Possibly there's a maximum one, too.

It's also possible that one civ advancing all the way through to the next following era may also trigger the 10 turn countdown to an era advancement, subject again to the minimum number of turns. I feel like I may have encountered that.