Civilization V: Who/What Am I?

Nice! My turn and should be easy:

clue 1. You should do it yourself but if someone does it instead, you can still use it
 
Wonders
 
clue 1. You should do it yourself but if someone does it instead, you can still use it
clue 2. However, it used to work really differently
 
An Ideology?
 
Pantheon
 
many of you are in the right ballpark :)

clue 1. You should do it yourself but if someone does it instead, you can still use it
clue 2. However, it used to work really differently
clue 3. and now it works well with the restriction removed
 
Piety

Clue 1 - With Piety you can use the Pantheon belief of other religions.
Clue 2 - The Piety tree was completely reworked because it used to be under powered. Also, before G&K it was more of a culture policy tree than a religious one.
Clue 3 - There used to be a restriction which made Piety and Rationalism (perhaps the best policy tree) mutually exclusive.
 
Oh not quite what I had in mind, but seriously close :)

clue 1. You should do it yourself but if someone does it instead, you can still use it
clue 2. However, it used to work really differently
clue 3. and now it works well with the restriction removed
clue 4. it creates a substitute for both gold AND production

should nail it now
 
City Connections, i.e roads and railroads?
 
Trade Routes (caravans and cargo ships)

edit: Dudewiththefood already guessed this.

Exploration (policy tree)
 
I may have misworded the 4th clue, sorry

like I said, Mesix got really close, the last two guesses were way off the mark
 
Top Bottom