What age/tech allows propaganda with diplomats?

AmericanDestiny

Chieftain
Joined
Jan 9, 2014
Messages
44
First spy I got I sent to Paris (rival in culture arena) as a diplomat to conduct propaganda. However I did not notice any modifier being applied to my tourism until I was in the Modern age. When can diplomats conduct propaganda and are they useless before that tech is researched? What else occurs during schmoozing?
 
I guess, technically, the prerequisite for Propaganda is either Industrialization or the Modern Era. Since Propaganda is conducted in a civ with a differing Ideology than the diplomat’s, the prerequisite is that there needs to be at least 2 civs that have chosen an Ideology. And they must be 2 different Ideologies, but I've never seen the first 2 Ideologies chosen in a game be the same.
 
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