Entering new eras

[comrade]

What does it do? Is there any bonus if you enter new era as the first civ?

[dannythefool]

The most obvious one is that more social policies are unlocked as you advance to a new era. They can make a huge difference.

City state benefits also increase with each era.

I don't think there's a bonus for the first player to reach an era but you will get above benefits for more turns.

[Ash_F]

No bonus for being the first civ, but you benefit more from allied city-states(culture, food, units) and unlock more advanced cultural policy trees.

Also the music and graphics change(the graphics of your cities and base units).

[yogibbear]

Do your unit upkeep costs change at era transition? I've had a few times where i got suspicious...

Also city defense scores/attack power increases. i.e. the most tech pushing civ has the best defense.

Also city state defense increases with highest tech leader. i.e. if you are worried about a city state getting overthrown by an angry London or Rome just tech up and their def/attack powers will increase to absorb the early push from AI.