I'm pretty sure there's no delay (considering how many times I've done it.) Also, new civics and religions take effect instantly, not on your next turn. This is pretty abusable, and I'm not sure it's a good thing. (The nice and not abusive part of it is you can see exactly what the upkeep costs for various civics will be like before deciding on one. I kind of like that part.)
As an example of abuse: Pyramids is *huge* with Spiritual, because you can use Representation to get +happy in your large cities, but any time you need to rush a unit out, you can queue it up, switch to Universal Sufferage, buy it to completion, and switch back to Representation... Which means a) no Medium upkeep cost, and b) you keep the +3 beaker bonus from Representation instead of getting the +1 hammer bonus from U.S.
I presume the same thing could be used with Slavery and Nationhoods' forcing powers. Perhaps also with Organized Religion to queue up missionaries. I've only personally used this trick with U.S., however.
(And this gives a potentially really good reason in a multi-player game to try to use the U.N. to lock down the civic-shifting possibilities for those pesky spiritual civs. Can't do that until very late, of course.)
As an example of abuse: Pyramids is *huge* with Spiritual, because you can use Representation to get +happy in your large cities, but any time you need to rush a unit out, you can queue it up, switch to Universal Sufferage, buy it to completion, and switch back to Representation... Which means a) no Medium upkeep cost, and b) you keep the +3 beaker bonus from Representation instead of getting the +1 hammer bonus from U.S.
I presume the same thing could be used with Slavery and Nationhoods' forcing powers. Perhaps also with Organized Religion to queue up missionaries. I've only personally used this trick with U.S., however.
(And this gives a potentially really good reason in a multi-player game to try to use the U.N. to lock down the civic-shifting possibilities for those pesky spiritual civs. Can't do that until very late, of course.)
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