Does unhappiness also negate positive modifiers too?

[Stalker0]

One thing I am noticing when I went on a conquest spree and my civ became unhappy...was that it was a lot worse than I thought!

Not only was I getting the -75% food for being unhappy, but that I was not getting my 25% bonus for my King Day. Production seems to work the same well as well. My 15% bonuses on my forge did not seem to apply when unhappiness was in effect.

So...keep those citizens happy!

 

[digitalcraft]

There's two levels of unhappiness. Between -1 - -10 you just get a big penalty on growth, but above 10 you also get a pretty big penalty on construction and unit combat strength. I haven't been to 20, so there may even be worse levels, I don't know. Maybe cities can revolt, who can say.