No.Civilopedia says that some political events, like winning battles affects happy faces. Is it true?
For example, in my curent game I have captured some cities of Romans and signed peace treaty with some benefit. In 12-pop city there are 5 happy faces, however there are only 2 luxuries. Amphitheater just increases luxury output, though luxury slider is 0 percent as you see. So how it really works? Do happy faces really appear if I win a battle? If I sign a peace treaty? For how long?