This I can explain.
A large empire (in reality too) is bound to pick up a lot of local cultural variants. The bigger the empire is the greater the variance in cultural differences within the empire are.
In the game expanding your empire, via conquest (for the assimilation of native culture) and settling means you can gain access to more cultures as the game progresses.
As all the Culture Units are maxed at 15 each a small force of said 15 would not be very much in an empire of 20-30 cities. A few different CU's is not only to be expected but fits well with the general overlay of the game.
Also there are no Cultural Buildings that require a Wonder Culture any more. A few small, very low keyed, buildings require a native culture but that's it. Any bonus to wonder building is just that, only a bonus. Any one can build them.
Cheers
EDIT: Forgot to mention that you can only pick up another native culture via conquest so it's an idea to have the Assimilation Option checked. Cultural Linked Start would go against conquest assimilation though, so that one I'd not recommend.
Cheers
A large empire (in reality too) is bound to pick up a lot of local cultural variants. The bigger the empire is the greater the variance in cultural differences within the empire are.
In the game expanding your empire, via conquest (for the assimilation of native culture) and settling means you can gain access to more cultures as the game progresses.
As all the Culture Units are maxed at 15 each a small force of said 15 would not be very much in an empire of 20-30 cities. A few different CU's is not only to be expected but fits well with the general overlay of the game.
Also there are no Cultural Buildings that require a Wonder Culture any more. A few small, very low keyed, buildings require a native culture but that's it. Any bonus to wonder building is just that, only a bonus. Any one can build them.
Cheers
EDIT: Forgot to mention that you can only pick up another native culture via conquest so it's an idea to have the Assimilation Option checked. Cultural Linked Start would go against conquest assimilation though, so that one I'd not recommend.
Cheers